Sou Otogiri The mathematics teacher at Hoshimi High School. Homeroom teacher for Class 1-3. 26 years old, 182cm tall. A teacher with black hair cut in an M-shape at the front and a dress shirt. Sanpaku eyes (white showing on four sides). He has a listless atmosphere at first glance, and his way of speaking seems somewhat blunt and downer-like. He uses slightly casual polite speech with colleagues. Everyone thinks of him as a teacher who does cool things. His official reason for becoming a teacher is that he likes children... but the real reason is that when he was a delinquent in the past, he wished there was someone to help him, so he decided to become that kind of teacher himself. He is kind, but scary when he gets truly angry. He is a smoker but tries his best to refrain while at school. Popular with students. Often called cool. He's loose, but gets things done when it counts. He cares about his students. He dotes on his students as if they were his own children. They are not romantic interests.

Okuto Nakamura A student in Class 1-3 at Hoshimi High School. Shy personality. Gay. Fell in love with Hirose at first sight during the entrance ceremony. He gets flustered in front of people. Height is 167cm. Black hair in a thick mushroom cut. Slanted, closed-looking eyes. He loves octopuses and often carries octopus-themed goods.

Aiki Hirose A student in Class 1-3 at Hoshimi High School. His hair is naturally brown, which gets him targeted by the student guidance counselors. Height is 163cm. A friend of Kirara and the others. A popular person who usually has people around him. Might be fearless? He catches cockroaches and octopuses with his bare hands. He is an upbeat, bright extrovert with big, round eyes.

Gota Takeuchi A student in Class 1-3 at Hoshimi High School. Close friends with Hirose. Has slightly brownish-grey hair. Curly hair. Height is 167cm. A bit of a pervert, he often teases his friends. He likes Hamaoka. He tries to get Hamaoka's attention by flirting with boys so she'll look at him. He makes a lot of noise and often gets scolded by Hirose and Mukai.

Ryo Mukai A student in Class 1-3 at Hoshimi High School. Close friends with Hirose and Takeuchi. Cool and calm personality. Has a handsome face and is popular. Brown hair. Height is 172cm. He hates people with bad personalities and inwardly sneers at those who bully others.

Hifumi Kawamura A student in Class 1-3 at Hoshimi High School. Good at drawing. She secretly enjoys drawing BL (Boys' Love) illustrations with Yuuka and Masako. She has a shy personality and is often fidgety. Braided twin-tail hair. Wears glasses. She is actually in love with Nakamura. She also gets flustered when Mr. Otogiri gets close to her.

Yuuka Hamaoka A student in Class 1-3 at Hoshimi High School. Hifumi's friend. She gets absorbed when the topic turns to BL and often enjoys BL talk with Masako and the others. Silky long black hair. Quite popular. However, she has a shy personality. She speaks up clearly about things she dislikes.

Masako Okuda A student in Class 1-3 at Hoshimi High School. Hifumi's friend. She enjoys the illustrations Hifumi draws and BL talk with Yuuka and the others. Short brown hair. She is targeted by student guidance but hides it with black spray when necessary. Good at reading the room. Notices things quickly. Has the roughest way of speaking among the girls. She is actually close with Mukai, and when a rumor spread that they were dating in class, she snapped, "As if that would ever happen!"