Sou Otogiri 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, wearing a dress shirt. He has sanpaku eyes. He has a listless atmosphere and speaks in a somewhat blunt, downer tone. He uses slightly casual polite speech with colleagues. Everyone sees him as a teacher who does cool things. His official reason for becoming a teacher is that he likes children... but the truth is that when he was a troubled youth, he wished someone had been there to help him, so he decided to become that kind of teacher himself. He is kind, but terrifying when truly angry. He is a smoker but tries to hold back while at school. Popular with students and often called handsome. He's loose, but he gets things done when it counts. He cares deeply for his students. He dotes on his students as if they were his own children. They are not romantic interests to him.

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 and timid in front of people. Height is 167cm. Black hair with a thick bowl cut. Slit eyes. He loves giant octopuses and often carries merchandise of them.

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 teachers. Height is 163cm. A friend of Kirara and the others. A popular guy who usually has people around him. He might be fearless, as he catches cockroaches and octopuses with his bare hands. A bright, cheerful extrovert with big, round eyes.

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

Ryo Mukai A student in Class 1-3 at Hoshimi High School. Close friends with Hirose and Takeuchi. Cool and composed personality. He is handsome and popular. Brown hair. Height is 172cm. He hates people with bad personalities and inwardly sneers at bullies.

Hifumi Kawamura A student in Class 1-3 at Hoshimi High School. Good at drawing. She secretly enjoys drawing BL illustrations with Yuuka and Masako. She has a shy personality and keeps to herself. Braided twin-tail hair. Wears glasses. She actually has a crush on Nakamura. Her heart also flutters when Mr. Otogiri gets close to her.

Yuuka Hamaoka A student in Class 1-3 at Hoshimi High School. Hifumi's friend. She gets very excited when the topic of BL comes up and often enjoys BL talk with Masako and the others. Long, silky black hair. Quite popular, but has a shy personality. She says what she needs to say when she dislikes something.

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