Hayase Nagatoro

"Will you keep running away from your weakness? Well, it's fun looking at someone as awful as you, but don't you want to get better? Do you want to stay awful like this? Awful Senpai ♥ Hey, hey; What will you do?"

- Nagatoro

Hayase Nagatoro (長瀞 早瀬) is one of the two main characters of the Don't Toy With Me, Miss Nagatoro manga series. She is a first year high school student who likes to tease and bully her Senpai, the other main character, although she secretly harbors feelings for him. Nagatoro is an energetic, athletic, popular and rather sadistic - but deep down very sweet - girl, often referred to as a "sadodere". She is part of a 'cool kids' clique together with her friends Gamo-chan, Yoshi and Sakura, and is a member of the swimming club, despite also having a liking for martial arts.

Her friends affictionally calls her with the pet name "Hayacchi" (ハヤっち), although this sometimes seems to annoy her.

Appearance
Nagatoro is an attractive, petite and short stature, first year high schooler with long, straight back hair pinned to the right side with a pair of white hairclips. She has brown skin with noticeable - though sometimes inconsistent - tan lines in the shape of her swimsuit, and large, expressive amber-maroon eyes. She has a metallic piercing on her upper right ear and both of her lobes are pierced, despite she rarely wears earrings. Compared to other characters, she is exceptionally small, although it has been hinted that she may have a late growth sprut, and has a lean, athletic, slender and very flexible physique with a modest bust size which she is often ashamed about despite being, considering her size and built, pretty average sized. Nagatoro is rarely seen without a sadistic, cocky smirk that often displays her very prominent canines, also, she has the tendency to widen the pupil of just an eye whenever she grins.

She typically wears her school uniform consisting of a white button up shirt (whose sleeves and collar she never keeps buttoned) and a navy blue skirt completed with a pair of sneakers and no socks. However, in summer she wears a short-sleeved shirt in her uniform, while in winter she is shown to wear tights and loafers. She is also often seen wearing the light blue and white swimsuit of her club.

When not at school she usually sports a simple, practical or tomboyish choose of clothing unlike most of her friends; however she has proven to know how to relatively dress up if needed.

Personality
Nagatoro come off as energetic, cheerful, sarcastic, flirtatious, prone to fast-talking and moving individual with a sadistic streak. She likes to bully Senpai and finds joy in teasing him, however, although it appears that she just wants to torture him, it seems that there's more to it than that. In early chapters her antics could easily be described as "sadistic", frequently making Senpai cry, but soon she began to gain feelings for the boy and even apologized for "doing messed up stuff" to him, and asked him why he didn't stand up to her. Since then her bullying has mellowed out, and she even frequently acts outwardly friendly to Senpai, despite she keeps calling him "gross". As time passes, she is also occasionally defend Senpai's dignity and even shows to be very concern about Senpai getting angry at her as well as sincerely sorry while going too far. Nagatoro is very much a tsundere, despite denying her crush for Senpai and frequently mocking him, she is very possessive of him and doesn't tolerate her friends to bully him. Despite frequently belittering him, she does cares greatly for Senpai, being quite bothered when he says that "all he can do is draw" and getting motivated/angered enough by his lack of self confidence to begin personally training him. She also enjoys Senpai's company very much, but rarely outwardly shows it. Albeit when she invited him to the beach or to her house, she shows her intentions to enjoy it and wanting to do it again sometime. However she reacts with extreme flustered nervousness whenever he does the same, for example her face wearing an expression with extreme shock once senpai joked about failing a grade to spend more time with her, though she was angry when he did not fail, saying "Do you hate spending time with me that much..?".

She is very good friends with Yoshi, Sakura and especially Gamo-chan, whom could be considered her best friend, despite their similar and often competitive personalities sometimes put them at odds in a sort of friendly rivalry. Also, Gamo-chan loves to tease her in order to made Nagatoro admit her feelings for Senpai and bring them closer, causing prank that sometimes led the two to resorted to near-physical violence despite they seemingly always made peace rather quickly every time they fight. Also, judging by their friends' reactions whenever Nagatoro and Gamo-chan butt hears, it's not wise to make yhem mad, implying that they both has a temper warranting fear.

Although very popular among boys, with several of them often attempting to hit on her or her friends, she always rejects them and showing herself bored, contrarian and standoffish while talking to them, even to the point of saying to Yoshi that "boys are boring", despite her obvious growing crush on Senpai. Her occasional coyness seems to be for Senpai alone. It's implied that Nagatoro uses casual rudeness towards Senpai in order to deflect her real intentions, taking three steps in with her suggestions ("let's wear matching yukatas for next year's festival"), and two out with her teasing ("I'm joking, that would be gross"), inching herself gradually closer to him, thus defusing the situation for the moment while leaving a kernel of hope for Senpai.

It's also shown that Nagatoro is a sweeter and more empathetic person than she lets on, and that she's more susceptible to Senpai's kindness than he realizes, even tenderly hinting to him - when he gives her his mail contact, all while telling her that he's not a person worth talking to - that his declarations of self-deprecation affect her too. Also, she has a deep sensitiveness toward the arts, whether is movies, paintings, dance, poetry or music. She seems to genuinely enjoy Senpai's art, frequently encouraging him to draw more and forcing him to use her as a model for his art. Though whether or not it's to train him to draw the female body, get him to draw her specifically, or is just an excuse to spend time and tease him more, is unknown. Nagatoro herself also occasionally draws.

Despite very frequently making sexual jokes to Senpai, mocking him for being a virgin and calling him a pervert, she is very nervous and sensitive about sexuality. For example: when Senpai was giving her a piggy back ride and his hand slipped to her upper thigh, she proceeded to jump off and ran away with minimal explanation and a nervous and terrified expression on her face, when Senpai meant to push her in the elbow and instead hit her breasts, she was very outwardly shocked and embarrassed for a couple of seconds, she had no problem in riding senpai like a horse for "muscle training" until when two unnamed girls saw it, making her very self-aware and causing her to immediately jump off, when she accidentally facetimed Senpai in the bath, she screamed in terror, when she and Senpai were trapped under a gazebo during the rain and he saw her drenched clothes and bra, she instantly blushed in frustration. Almost all those times, however, Nagatoro recovered after a couple of seconds and started again to accuse Senpai of grossness and sexual perversion, though he eventually realized that Nagatoro would be at a loss if he actually respond to her taunts and, romantically, Nagatoro is all bark and no bite, especially due to the fact that she can get as embarrassed as he does. The hypocritical humor of Nagatoro constantly teasing Senpai about being a virgin is that she's obviously as inexperienced with physical intimacy with the opposite sex as he is.

Nagatoro has a complex for her bust size and appears to be very self-conscious as well as jealous and possessive. In the beach chapter, when Gamo-chan and Yoshi were harassing Senpai with their large boobs, Nagatoro get frustrated, took off her clothes as well, stood in a bikini in front of him and demand Senpai to go buy drinks. She also was mortified when learning of Gamo-chan's prank to have Senpai "molest" her boobs - due to her jealously since she is the less buxom among her friends - but nervously laughed it off as an hilarious prank once learned that she had stuffed anpan in her breasts and Senpai never actually touched 'em. It also appears her teasing is somewhat just a front, a coping mechanism to mask her insecurities and inner nervousness.

She is also very athletic, loves the beach, and is a fantastic swimmer as well as having a huge passion and proficence in various styles of martial arts; she shows her willingness to train Senpai after his poor performance at a marathon and easily outpaces him during their training run.

Apparently Nagatoro doesn't like shoes, as she almost never wears socks and is frequently barefoot when she can get away with it.

Early life
Hayase was born in, the second child of the Nagatoro family. She has a close relationship with her older broter, Ichirō, and her parents are middle class and often work late. She grew up in a house in the suburbs right in front of a park, under a 7-eleven; as a child she went every year to the summer festival with her family, enjoying the fireworks contest at the beach, also she often visited the zoo, at least until the end of primary school.

Nagatoro made friend with Gamo-chan and Yoshi around their middle school years, while Sakura's friendship with the group seems to be more recent. After beginning to attend Kazehaya High School, all four of the girls were placed in the same class, 1-B.

Ever since they reach teenhood, her friend Yoshi tried to be the matchmaker for Nagatoro, introducing her to various boys, however she cannot bring herself to like any of them, having no significant relationships with the opposite sex.

She joined the swimming club under their request and was given the president's old swimsuit.

Meeting Senpai
One afternoon, while chatting with her friends on the school's library a second year student walked in trying to stay unnoticed, until the pages of a manga he drew fell on the floor and are immediately spotted by the girls who started to mercilessy criticize it and making fun on him. Nagatoro was the only one who remained after her friends left the room and then mock her Senpai, noticing the manga protagonist was a self-insert of him, but acted more manly than he could ever do. Crushed, the boy started to cry and she gently wiped his tears away with her handkerchief, cheerfully apologizing for having bullied him and run away.

The following day she approached the boy in the school corridor right out of the art club room, discovering he was it's only member. He gave her back her handkerchief and told her to go away but, instead she proposed model for him as an apology for having bullied him the previous day, sexily told him that if he made a good paint of her she would give him a "reward". However, due to the final result being more similar to a sketch since he was too embarrassed to look at her for more than a second, she started to mock him again and reduced him to tears for the second time.

The following day Nagatoro met Senpai on the street and started to tease him once more, then she asked him why he never got mad with her, despite the fact she did lot of messed up things to him, to whom he answered that he doesn't dislike talking with her. After this, she formally introduced to him, despite preventing him for doing the same, saying that she preferred to call him just "Senpai". After this, the two formed a weird friendship-like relationship and quickly became inseparable. Nagatoro started hanging out in the art club room daily after class in one occasion she mocked the manga Senpai read calling it "lewd" and causing an incident after which they both tumble down and her right hand accidentally landed on the boy's groin, embarrassing them both, while in another occasion she tried to re-enact a vampire movie they saw on TV and bite his neck, pinning Senpai to the ground but backing off at the last time due to the garlic in his breath from the yakisoba he previously eated.

Despite her usual coldness toward boys, Nagatoro visibly started to enjoy Senpai's company sexily teasing him at every occasion, even for the simpliest thing, like washing their hands together. She also kept forcing him to draw her, even bringing a sofa in the art club room so she could do many different poses; due to Senpai having difficulties in drawing her, after a while, Nagatoro felt sleepy snd shifted position one more time to lie down for a moment, remembering him he would get a reward if he painted her well enaught. After she woke up, the girl discovered he managed to paint her and, keeping her promise, kissed him on the cheek.

Over time she even start to get concerned about hurting his feelings and tried to help Senpai respond to his disses by improvisating a manzai sketch (Japanese cabaret) to make a retort to her insults. However Nagatoro went too far insulting him he eventually get offended. Realyzing her error, Nagatoro apologized and tried to cheer him up, telling him to hit her shoulder to make a cameback, however as he did it, due to the tears in his eyes and the anger, he accidentally hit Nagatoro's chest instead of the shoulder, making them both embarrassed but resolving the tension.

Introducing Senpai to her friends
One day Nagatoro invited Senpai to have lunch with her, Yoshi and Gamo-chan at the school cafeteria, introducing him as his boyfriend. Getting jealous, her two friends started to tease him and calling him names, causing the girl to get angry and eventually taking his defences, prompting Senpai to admit he wasn't actually his boyfriend. The two girls burst out laughing at the futility of his statement and apologizing to him, admitting he was a very funny guy. Afterwards, Nagatoro has a "nipple-poke game" with Senpai using as a prize a special ticket that would have forced the loser to do anything the winner would have ordered; she won and told him that one day, once he forgotten about it, she would have used the ticket, warning him to be prepared.

The day nagatoro pierced again her lobe to prevent it for completely heal, she pranked him suggeesting to pierce his ear too so they could have a matching pair of earrings, but instead barely poked his ear, asking if he was disappointed that she didn't "made a hole in his body". Also, she found out he has inserted a character with her likeness in his manga, being quite amused about it, and, when the students have started to wear the summer uniform, thus allowing her to see how skinny Senpai's arms were, she offered to train him. However due to his laziness, Senpai stated thath he would have do a training only if it was possible to do it without moving, prompting Nagatoro to order him to get on all four and riding him like a horse for muscle training until two girls passed by the corridor and saw them making her very self-aware, leading her to jump off while Senpai collapsed to the ground.

Sometime later, noticing his hair has gotten too long, Nagatoro proposed to Senpai to cut them like she often did for her brother, however after she exited the art club room to borrow a comb, Yoshi and Gamo-chan entered and, seeing the electric razor that Nagatoro left behind, decide to try shave Senpai, however he opposed to them, shouting that he already promised to Nagatoro he would have his hair cutted by her. In that moment she went back, causing her friends to run off, then Nagatoro cut Senpai's hair and they shared a sweet moment as he thanked her.

The following day, after being caught in a storm Nagatoro and Senpai seeks refuge under a gazebo in the park, then after it get worse, the girl asked him if he wanted to stop by at her house, where they clean off, changed clothes, took a cup of tea and enjoyed at afternoon playing videogames together. While departing, Nagatoro told Senpai that they should did it again sometime.

After her friends pranked Senpai by making him touch Gamo-chan's breasts and Nagatoro saw it, she was utterly mortyfied but Senpai quickly explained the girl has actually stuffed anpan under her shirt, causing Nagatoro to cheer up and laugh it off as an hilarious prank. Relleved, the girl offered him to try pinching her upper arm, revealing only after he did it that the upper arm's texture was the same of boobs.

Summer break
At the beginning of summer, Nagatoro and Senpai went to a place she knew to get some shaved ice, however they discovered a massive crowd of people lined in front of it. The girl stubbornly decided that they would have waited their turn in line, prompting Senpai to protect her twice as from people who ogled at her due to her uniform getting transparent and from getting an heatstroke, eventually he dragged her out of the line to a vending machine and bought her some water to prevent her for getting dehydrated, impressing and deeply moving the girl, who o buy some convenience store ice cream just like Senpai previously told her to do, composed an haiku to celebrate the moment and offered an embarassed Senpai to feed him.

The day before summer break began, Nagatoro asked Senpai to exchange mail contacts and was overjoyed after he accepted. When he told her there was nothing special in having his line ID, she sweeten up and tenderly saying that she believed otherwise. Then, after parting ways, she sent him some cat-sticker for being a "pervert" as he was about to drink from the water bottle from which Nagatoro stole him some sips.

The next day, Nagatoro invited Senpai to join her and her friends at the beach for the following afternoon. After arriving, she became quite jealous that the boy briefly ogled her friends more buxom physiques, and was visibly upset when, after Gamo-chan proposed to go swim all together, he refused, taking a sketchbook out of his bag to begin drawing. Then, albeit unable to fully enjoy it due to feeling bad about Senpai, Nagatoro has a swimming competition with her friend/rival, who also tried to cheer her up saying that if he didn't wanted to swim they couldn't force him. However, Nagatoro went to him and asked what was going on, prompting him to confess he couldn't swim and had huge fear of getting sunburned. The girl offered him the 50+ sunscreen, stripped him and said she would rub it on him, embarrassed Senpai replied that that would have been something boyfriend and girlfriend would do, pointing out that they weren't. Feeling irrationally offended by his words, Nagatoro pinned him to the ground and started to rub the lotion on him with her foot in retaliation. However both of her friend soon joined her in giving Senpai said treatement, prompting Nagatoro to stop after using the whole bottle and fully covering him on sunscreen. Then, the whole group ended up having a good time, making another swimming competition together, playing with sand and eating ramen at the beachside. The next morning, she asked Senpai at the phone how did he felt about having come to the beach with them and he admitted that it was actually fun.

The night of the summer festival, Nagatoro was forced to go to school due to having a special club practice; thus she informed her friends about it. That evening, however, after she finished her duties and was in the locker room with the club president, she apologized for having make her stay up until that late and asked if she planned to go at the festival with someone. Nagatoro blushed and thought to Senpai, prior to receiving a notification at her smartphone and saw that Gamo-chan has sent her a picture of her and Yoshi at the festival with Senpai. The plan set by her friend to made her jealous, thus prompting her to came, worked and Nagatoro run from the swimmin club's lockers to the temple where Senpai was held "prisoner" by her friends, lying that she finished earlier and only came there since she was free. Wanting to tease her friend/rival about her feelings for Senpai, Gamo-chan told her that if she wanted to free him she had to defeat them in some games at the festival. Competitive as always, Nagatoro accepted the challenge but not without insisting that she didn't care for Senpai at all. They began with a shooting game, splitting for a 2 vs 2 team battle in which the winner would have been the pair who managed to get the most decent prizes. Paired in the same team with Senpai, Nagatoro asked him why she was at the festival, to which he lied that he wanted a change of pace, Nagatoro replied asking if he was waiting for her to invite him, making him blush as it was the truth. The girl then pointed out that if there was a place he wanted to go with someone, he had to invite that person himself. After playing some other games, Nagatoro and Senpai managed to win a big squiddy peluches and, knowing Yoshi collected them, Nagatoro gave it to her, thus "birbing" her and winning the contest. Gamo-chan immediately freed Senpai from the collar and left together with Yoshi in order to let the pair enjoy some time alone at the festival. Then, Nagatoro and Senpai decided to wander around the festival together, eating takoyaki and cotton candy, after a while Nagatoro expressed out loud her tought that if felt like being on a date, before quickly correcting herself adding she was just joking. Nagatoro suggested though that she could play pretending and gave him a taste of what dating feel like, so she asked if he wanted to try hold hands, before he could answer the fireworks started causing the girl to getting ansious as she loved their town's fireworks, despite Senpai admitting he only saw them once in primary school. Since they found the fireworks contest on the beach too crowded, Senpai grab her by the hand to prevent that she was caught between the crowd due to her short stature, and drag her to a spot in the woods from which they had a great view on the fireworks. Feeling unconfortable for the romantic situation, Nagatoro started teasing Senpai asking what was he thinking bringing a girl on a dark spot like that and calling him a "perverted virgin". Realizing from his past experience that Nagatoro got embarrassed pretty easily herself, Senpai decided to gave her a taste of her own medicine asking her what she meant for "lewd stuff". Too ashamed to answer, Nagatoro started to stutter something regarding embracing and kissing, claiming that anyway there wasn't a chance he could do something like that, causing Senpai to ask her if she believe she could. Despite stating she totally could, after the fireworks lighten the place, showing lot of couples kissing all around them, they both got embarassed and run away to see the fireworks quietly in a more hidden place.

New semester
The first day of the new semester, after class, Nagatoro sat at the gazebo in the park close to her home chatting with Gamo-chan, Yoshi and Sakura when they were approached by a couple of boys who started to hitting on them, she tried to ignore them annoyed as always, until Senpai, who was looking at them from a distance too embarassed to came any closer, was greeted by Gamo-chan who ask him to sit with them, giving Senpai enough confidence to propose Nagatoro to walk home with him. The girl accepted and was soon joined by her friends, who then leave the two guys behind; after Senpai asked if it was okay for the girls not staying with them, they told him those two were "annoying" and started to jokingly tease him. All five of them smiled hearthly.

The next day, while passing by the corridor, Nagatoro saw her friends dragging Senpai inside their classroom closing the door behind and eavesdropped from behind it, hearing Sakura intended to "jerk off" boy she get jealous and storm into the room angered only to discovered she misunderstood the situation and she was trying to "yank off" a splinter that went inside his finger; frustrated yet too prideful to admit it, simply took the tweezers from Sakura and yank off Senpai's splinter herself as her friends applauded.

Few days after this, while they were walking home together, Nagatoro challenged Senpai to a game of 'rock, paper, scissors' in which the loser would have carried the winner's luggage until they reached the following crossroads. After losing the first match a sulking Nagatoro found herself forced to carry Senpai's bag, then, winning the second the boy carried hers and, after she won the third the girl forced him to give her a piggy ride; however while doing it, Senpai's hands started to slip to Nagatoro's upper thigh, causing the girl to jump off and, with minimal explanation, run away with a nervous and terrified expression on her face.

After seein Senpai's poor performance at the school marathon, Nagatoro playfully told him that, as his kōhai, she was embarassed for him, however when he replied that "all he can do was draw" she was greatly bothered, getting so motivated and angered by his lack of self confidence to begin personally train him. The following day, despite being a weekend, she forced the introverted boy to join her in a marathon training, turning him on due to her attire and causing him to stare at her sweaty and barely covered behind while running their 5Km route, thus he aumented his pace in order to stay in front of Nagatoro and don't risk be accused of perverted thoughts. However, after covering half of the route, Senpai collapsed and asked to stop, causing Nagatoro to insult him to provoke him, going as far as to slap her own butt telling him to try to catch her if he was angry. Senpai reprised the run angrily, causing the girl to smile and sweetly told him to do his best.

Sometime after this, while hanging out in the art class room with him, Nagatoro criticized Senpai for never exiting his comfort zone nor taking some risk, suggesting for example that instead of drinking every day the same standard flavoured orange juice, he should try taking the "mistery juice" in the vending machine close to the school, however he noticed that Nagatoro herself has that same orange juice, prompting him to told her she was the same as him regarding taking risks. Sulking, the girl replied that she usually didn't drink that kind of juice, so it was risky enough for her. After taking a few sip, Nagatoro sat back on the sofa while Senpai continue drawing, then he took a sip for his orange juice and placed the bottle on the same stool over which Nagatoro placed hers. The collision made both bottles fall but Senpai was quick to getting them back, however he couldn't recognize anymore which one was his and which Nagatoro's. Noticing the girl was silently watching, and not wanting to be mocked for an accidental indirect kiss, Senpai tried to watch her reaction as he moved his hands from a bottle to the other but Nagatoro had an impassive expression. It was unclear if she saw which one was her bottle or was unable to tell it so, feeling thirsty, he decided to take the risk drinking from one of them. Seeing this, the girl blushed and, without saying anything, drank from the other bottle. If they actually do indirecly kissed was left ambiguous.

After the school cafeteria where Nagatoro and her friends usually chat has been invaded by a group of boys they deemed as "loud and annoying" the girls turned to the teachers but they told 'em to solve it on their own, prompting them to decide to hang out in the art club room instead, while Sakura is working on seducing them one by one in order to sew seeds of jealousy in the group and making it collapse as they all began to compete for her attention. After they explained the situation to Senpai, complaining on how all men are driven primarily by their sexual desires, Gamo-chan teased Nagatoro stating that Senpai instead doesn't have any libido, prompting the girl to made a bet with her friend that if she find a lewd book hidden in the room by him she would have proved he was actually a quiet pervert. Nagatoro turned the room upside down, Senpai yelled he's not hiding anything, to which both Yoshi and Gamo-chan agreed despite Nagatoro stating that he was losing his cool since she was about to find his porn. After a while he began to feel bad about Nagatoro losing the bet since she was, in a certain way, doing it for him and taking advantage of a moment of distraction from the girls, he sneaked insid the prep room, where he hid Yagamirin Tarou's "Paradise Harem", took it and allow Nagatoro to find it. The girl was overjoyed and started to playfully tease him, while her friends watched the scene perplexed.

One day, Nagatoro noticed Senpai is having a bento and he explained it was due to not having lots of money that month, however, seeing how messed up it is, she began to make fun of him. That evening, Nagatoro prepare an homemade bento with the intention to share it with him the next day and confide it to Gamo-chan; however her plan backfired since, feeling offended for her comments the previous day, Senpai has prepared an exceptionally well-made bento in order to teach Nagatoro a lesson. Slightly upsetted of this, even after both of her friends exchanged a piece of their lunch with a bite of Senpai's bento, explaining her how amazingly good it was, Nagatoro pridefully refused to do it as well and started to eat her bento. Wanting to help her friend, Gamo-chan suggested Senpai to swap a dish with Nagatoro, yet they are both too stubborn to ask for the swap. In order to resolve the stalemate, Gamo-chan revealed that she was surprised he made chicken that spicy as he wasn't good with spicy food while Nagatoro loved it, prompting the boy to admit it was actually too spicy for him, this granted Nagatoro the chance to ask for a swap making it seem like she was doing a favor to him; she gave Senpai the homemade dish she knew was his favourite (despite it contained spicy mustard too) while Nagatoro ate Senpai's chicken and has a "foodgasm" just like her friends had.

After Sakura began getting stalked by one of the many boys who compete for her attention and asked Senpai to pretend to be her boyfriend in order to discouraged him from continuing. jealous, Nagatoro tried to convince her friend to change her mind, calling Senpai "dengerous as a vermin", but she was ignored and caused the opposit effect convincing Senpai to play along with the gal's plan. The following day, being saturday, Senpai and Sakura went on their fake date while Nagatoro, Gamo-chan and Yoshi followed them recording everything with their smarthpones. Gamo-chan teased Nagatoro saying it was like an anime plot when "two people went on a fake date but real feeling start to blossom" thus getting her friend frustrated despite firmly refusing to admit it. Before Senpai and Sakura could get too close, Nagatoro captured the stalker and forced him to promise that he would never do it again. Having put an end to the charade, the girl began to mock Senpai for ruining "his first date" by telling him that it was probably too soon for him to do such things, however he smiled and agreed.

While they were all on the art club room, Nagatoro told Gamo-chan and Yoshi how she scared Senpai with the idea of repeat one year and be in their same class, thus making him franatically study to pass the exam. Amused the three girls started to toy with the idea of what would they do if he failed the grade two times thus making them "his senpais". However, as the boy started to fear the three girls would have enslaved him if that ever happened, Sakura reassured Senpai that it won't happen because other than Nagatoro both she and the other two girls will have to take supplementary lessons due to their low academic results. Embarrassed, both Gamo-chan and Yoshi asked Senpai to tutor them, making Nagatoro jealous.

Webcomic
In the original webcomic, Hayase Nagatoro is often the only character seen by the reader due to the issues being mostly narrated by Hachioji senpai's point of view. In said iteration she is a malicious sadist whom evidently gains pleasure by hurting others, is violently abusive both physically and emotionally towards the male protagonist and rarely apologized to him or shows any signs of caring. At the beginning of the story she and Hachioji apparentely knew each other for a while and, the day after having cheered for her at a sport competition, he invited her at the park in order to try asking her out; anticipating his intention, the girl started to insult him stating that he was unworthy of her affection and calling him "gross", "embarrassing", a "maggot", "human garbage", a "pig" and a "cockroach", until he finally confessed his love to her and asked her out, which she accepted telling him that she was doing it only to make him her own toy to play with and that she would have made fun in breaking him. Since then, Nagatoro and Hachioji started to date, however she kept torturing him, though he reached breaking point when the girl made him believe her brother Ichirō was her real boyfriend and she was merely toying with him; although eventually he takes her back. Nagatoro went as far as to proposing Hachioji that if he allowed her to use his butt as a sandbag for practicing kicks she would have go to the ocean with him. Despite promising to kick him very lightly, during said practice she got visibly aroused over the pain she was inflicting to him and started to hit with powerful muay thai kicks. However, when the last bow sent him to the ground motionless she got worried, apologized and told him to be prepared as she would "train him like an animal" when they would go to the ocean. Gradually, over the years, Nagatoro seemingly sweeten up a bit over Hachioji and on the Christmas night of her (presumably) last year before graduation, they went on a date, sharing a dinner at a ramen kiosk since she deemed more "christmasy" stuff "too lover-like" for them. Walking home they take two can of hot coffee while sitting on the park and talked about their dreams for the future before exchanging Christmas gift: Hachioji gave her a muffer while the girl, showing she wasn't completely changed, gave him a choker, saying it has been hard for her finding one of the right size and that she hoped it suits him properly.

Sometime after (or maybe a little before) this, the couple sat on a on a park bench looking at a dead cicada that was eaten by ants while eating ice lolly. Saying the bus came out the safety of underground, eventually facing death in order to do "lewd things", Nagatoro started to tease Hachioji senpai with some sexual remarks, before to showing him that the stick of her ice lolly has a sign that marked she has won another one as a prize and wenting to take it alongside him.

Trivia

 * While first explaining how to write her name, Nagatoro said the first kanji means "long" (長) while the second, toro (瀞), is actually pretty uncommon and doesn't have a proper translation.
 * Although Nagatoro is noticeably darker than most other characters, it is implied to be just a tan from her swimming club activities, as evidenced by tan-lines in the shape of her swimsuit.
 * Also, in the Issue 4 of webcomic, set in winter, she's a lighter shade.
 * It's implied by the initial chapter's extras that Nagatoro may have ended up bullying Senpai unintentionally to begin with, as she wonders whether she came off too strong and brusque against him from being overexcited.
 * This also implied that she approached Senpai with the intention of being flirtatious but she went overboard, and that she has liked him since the beginning of the story.
 * She's sometimes drawn with noodly arms when she gets playful with Senpai, turning into what fans call "Noodletoro".
 * Not knowing their respective names in the first two chapters Senpai only referred to Nagatoro as "that girl" or "kōhai" (meaning "junior", the opposit of "senpai"). Later, she formally introduced to Senpai in Chapter 3 telling him her surname and saying she doesn't care about knowing his real name, as she was fine with calling him just "senpai". Since then, the protagonists began to refer to one another as "Nagatoro" and "Senpai" respectively.
 * However, since in Side Story 5 (chronologically placed before Chapter 35) she read Senpai's midterm test, which had his name written on it, it could be assumed Nagatoro knew his real name as of that moment or maybe even prior to it.
 * On the other hand, Nagatoro's friends constantly called her "Hayacchi" in front of Senpai, with the first time being Chapter 11, suggesting he found out her first name in that occasion.
 * She is a fan of horror movies, expecially with vampires.
 * After having dreamed of her in a cat-like form in Chapter 9, Senpai start to associate Nagatoro to a cat in his subconscious, even wenting so far as to assume out of nowhere that she actually has a pet cat, which in Chapter 18 is revealed not to be the case.
 * The cat-version of Nagatoro, originally dubbed Nekotoro, was then drawn by Senpai in Chapter 14 and on said basis a costume was made on Chapter 36 during the "Culture Festival Arc", being officially re-named Toro Cat in Chapter 44.
 * Nagatoro usually doesn't play video games and is quite poor at them.
 * Both Nagatoro and Gamo-chan shares the love for marlowe pudding, and apparently is often the many prize for the bets and competition their friendly rivalry is composed of.
 * Nagatoro likes and spicy food, a flavor that she loves on any kind of food, including ice-cream. Also, her favourite dishes at the sushi are negitoro maki and maguro nigiri, while her favourite snacks is koshian and the one she dislikes is tsubuan.
 * Despite she once stated she dislikes apparentely, after she helped her club to organize a yakisoba stand for the Cultural Festival as they did every year due to a 20 years tradition she started to liking it, joking about buying 100  and 100 yakisoba to bring them home and freeze them in order to ate them everyday.
 * Even in the videogame Escape from the Room with my Kōhai a cup of yakisoba is what the player gave to the character in order to cheer her up.
 * As surprisingly revealed in Chapter 35, Nagatoro is rather competent academically for a girl who procrastinates as much as she does.
 * Nagatoro is often mocked by her peers for "playing with food" or ruining it due to her weird tastes.
 * She's a very light weight drinker.