Naoto Hachiouji

Naoto Hachioji (八王子 直人, Hachiōji Naoto) is the protagonist of the manga. He is a timid introvert, who tries to avoid social interaction with other people and likes to draw. Nagatoro only calls him Senpai. It is currently unknown if Senpai has any friends, and any form of family has not been mentioned either.

Appearance
Large metallic tank

Personality
He is very frail and weak, unable to lift up the relatively small Nagatoro or fight off any of her bullying. He almost always takes her bullying at face value, in early chapters he usually responded by crying or attempting to look away, but as the series has gone on he has gotten used to being bullied and several times has rebuked Nagatoro and even teased her back a small amount of times.

He is very skilled at drawing manga and enjoys shonen manga, typically those with large amounts of fan service (though he is very defensive about it when called out by Nagatoro, saying he only likes it for either the comedy, or action, or art). He runs his own fantasy manga series, where the main character, a swordsman, is a handsome-er, more manly self-insert of him.

His self-esteem is very low, frequently saying 'all he can do is draw', and even then he frequently has trouble getting inspiration to draw, and ends up beating himself up inside about it. He began the series unable to draw the female form at all due to nervousness, but now can pretty faithfully draw Nagatoro accurately.

He does not enjoy much in life besides playing video games, drawing, and spending time with Nagatoro. He does not like going outside, or athletics. He, apparently, has no other friends other then Nagatoro, as shown by the fact he never interacts with anyone else and has been shown he has no other numbers in his phone, other then Nagatoro.

He is also known to be easily embarrassed and very shy when it comes to girls, especially Nagatoro who may or may not have a crush on.