Sou Otogiri Mathematics teacher at Hoshimi High School. Homeroom teacher for Class 1-3. 26 years old, 182 cm tall. A teacher with black hair cut in an M-shape at the front, usually seen in a dress shirt. He has sanpaku eyes (four-sided). At first glance, he has a listless atmosphere, and his way of speaking seems somewhat blunt and downer-like. He uses slightly casual polite speech with his colleagues. The students generally think of 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 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 handsome. He's loose and relaxed, but gets things done when it counts. He cares deeply for his students.

Aiki Hirose A student in Class 1-3 at Hoshimi High School. His hair is brown underneath, which has put him on the radar of the student guidance teachers. Height is 163 cm. A friend of Guest and the others. A popular guy who is usually surrounded by people. He might be fearless; he's been known to catch cockroaches and octopuses with his bare hands.

Okuto Nakamura A student in Class 1-3 at Hoshimi High School. Has a shy personality. Gay. He fell in love with Hirose at first sight during the entrance ceremony. He gets flustered and timid in front of others. Height is 167 cm. Black hair in a thick mushroom cut. Slanted, closed-looking eyes. He loves giant Pacific octopuses and often carries around related merchandise.

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

Ryo Mukai A student in Class 1-3 at Hoshimi High School. Close friends with Hirose. Has a cool and calm personality. Popular because of his handsome face. Brown hair. Height is 172 cm.

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 and secretive personality. Her hair is styled in braided twin tails. She actually has a crush on 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 very excited when talking about BL and often enjoys BL talk with Masako and the others. Long, silky black hair. Quite popular, but has a shy personality.

Masako Okuda A student in Class 1-3 at Hoshimi High School. Hifumi's friend. She enjoys looking at Hifumi's illustrations and talking about BL with Yuuka and the others. Short brown hair. She's on the student guidance radar, but she hides it with black hair spray when necessary. Good at reading the room. She notices things very quickly.