Issue 3

"Nagatoro-san's sandbag" (長瀞さんのサンドバッグ) is the third issue of the Nagatoro-san webcomic.

Summary
Hayase Nagatoro asked Hachioji if he was exercising enough, since he was really pale and always locked inside the art club room to drawing, then she mocked him for lacking any athletica ability saying that even if he tried a sport he would most definitely fail. She said that, as his kōhai, she was worried for his health if he kept going with that lifestyle and offered to go at the ocean together with her so she could personally train him and teach him how to swim. Then she laughed and said she was only joking as she had no intention to spent a week end at the ocean with him, saying it was "gross" that he really believed the contrary. After the boy sulk Nagatoro sarcastically apologize and then told him she had lately developed an interest in martial arts and became addicted in kicking, thus she offered him a deal: if he allowed her to use his butt as a sandbag for practicing kicks she would have go to the ocean with him. At first Hachioji refused but then the girl told him she would have asked it to someone else in the school due to being very popular among boys, making him jealous and prompting him to accept. Thus Nagatoro told Hachioji that she loved him and promised to kick him very lightly.

After going out on the school's backyard, Nagatoro told Hachioji that she would have kicked him 30 times and if he didn't count any of her kick she would have started all over again. At first the girl's kicks didn't hurt him and he found them almost pleasurable, while on the other hand Nagatoro found his butt to be very soft and began enjoying kicking it more and more, until, after reaching the 21th kick, she revealed having began attend an MMA gym and that her former-champion teacher said she was a natural. So she hit Hachioji with a powerful muay thai kick sending him to the ground, thinking how painful it was and how amazing it looked that someone with such a small body as Nagatoro could kick with a similar force.

After ordering Hachioji to stood up he obeyed despite being certain that she was doing this because she won't go to the ocean with him. The girl said that they should start all over again since he didn't count her last kick and began hitting her senpai in the same painful muay thai style at each kick of the new series. After a while, both of them were drenched in sweat and Nagatoro pressed her body against Hachioji's back starting to powerfully hit his butt with her knee, instead.

Having gotten visibly aroused, Nagatoro whispered to Hachioji's ear that it was her first time hurting someone so much, then asking him if it was the same for him and if that was the worst pain he ever experienced in his life. The boy remained silent and Nagatoro took it as a yes and started hitting his butt again in muay thai style.

After reaching the final bow, Nagatoro hit him so powerfully that Hachioji landed on the ground motionless. Getting visibly worried, the girl sweeten up a bit and sincerely apologized for having gotten too caught up in the fun to think about his well being, however he quickly forgave her.

Having been cheered up, Nagatoro reminded Hachioji that he stopped counting at 29, however she decided to give him a freebie pretending he made it up to 30. Then she told him to free up the weekend, warning him she would "train him like an animal" when they would go to the ocean.

Characters

 * Hayase Nagatoro
 * Hachioji

Trivia

 * This is the first physical appearance of Hachioji in the series, since in the previous two, and following one, he was the POV (point of view) of the reader while in this issue, since page 17 to 64, the reader has a third-person prospective.
 * In this version, the character doesn't wear glasses, which is similar to what happpen in the manga after Chapter 73 when Senpai start to wear lenses.