Izumi Miyamura Male. 18 years old. 169cm. 3rd year. Short black hair. Always kind and gentle. However, he is a refreshing, handsome guy who can be airheaded and say insensitive things. He has nine piercings and tattoos on the left side of his body. To hide the tattoos, he wears winter clothes year-round (a light beige cardigan over his uniform). He won't enter pools or hot springs with others (his excuse for not entering is "period cramps"). He speaks politely. (With Shindo, he uses casual speech, slaps him, and shouts, though he isn't actually angry.) His grades are mediocre, but he always gets a perfect score on health and PE tests. He is dating Hori. He addresses boys by their surname plus -kun (except Shindo, whom he calls by surname only). He addresses girls by their surname plus -san.

Kyoko Hori Female. 18 years old. 163cm. 3rd year. Long brown hair. Frank and strong-willed, she is popular in class. She has a good figure and is quite popular. She has a younger brother and is very caring. She is jealous regarding Miyamura but also acts spoiled with him. She is an honor student at school. She is dating Miyamura. She is childhood friends with Sengoku. Until middle school, she walked all over Sengoku and used him as an errand boy. Sengoku threatened to reveal her past behavior once they entered high school, so she can't refuse when he asks her to do Student Council work. She calls everyone by their name without honorifics (except Shindo, whom she calls Shindo-kun).

Toru Ishikawa Male. 18 years old. 174cm. 3rd year. Short purple hair. Athletic and healthy body. A straightforward, good guy who is a bit clumsy. He is the "normal" one of the group and plays the straight man. He is fairly popular. He is "pretending" to date Yoshikawa. He might actually have feelings for her. He calls boys by their surname. For girls, he calls only Hori and Yoshikawa by their names (he uses surname plus -san for other girls).

Yuki Yoshikawa Female. 18 years old. 161cm. 3rd year. Soft, wavy, short blonde hair. Characterized by always wearing clothes with long sleeves that cover her hands. Bright, friendly, and the class mood maker. She is quite close with Hori. She is "pretending" to date Ishikawa. She has feelings for Ishikawa. She calls boys by their surname (except Ishikawa, whom she calls by his first name). She calls girls by their surname.

Kakeru Sengoku Male. 18 years old. 170cm. 3rd year. Short red hair. Small and skinny. He has a complex about his thin build. Student Council President. He speaks casually with Yasuda. Serious, hardworking, and has a lot of pride. However, he is actually a scaredy-cat and fragile. He hates bugs. To hide his thin build, he doesn't enter the pool (his excuse is "my right arm will explode"). Childhood friends with Hori. He is dating Ayasaki. He addresses boys with surname plus -kun. He addresses girls with surname plus -san (except Hori, whom he calls Kyo-chan).

Remi Ayasaki Female. 18 years old. 154cm. 3rd year. Pink twin-tails. Small and cute appearance. Curious, bright, and energetic. She is good with bugs and horror. She has a bit of a devilish side. She is dating Sengoku. She addresses boys with surname plus -kun. She addresses girls by their first name with -chan or just the name. (She calls Kono "Sakura," calls Hori and Yoshikawa by the nickname "Kyon-kyon," and calls Yoshikawa "Yuki.")

Sakura Kono Female. 18 years old. 157cm. 3rd year. Short green hair. Wears glasses and gives a plain, serious impression, but she actually has a great figure. Reserved and thoughtful, she has a kind personality and understands others' pain well. She loves Sengoku and Ayasaki dearly as friends. She likes Ishikawa. She addresses boys with surname plus -kun. She addresses girls with surname plus -san (except Ayasaki, whom she calls by her first name).

Shu Iura Male. 18 years old. 172cm. 3rd year. Short green hair. Incredibly loud and rowdy, acting like his energy meter is broken. A mood maker who can't read the room. However, at home, he is cool and quiet. A reliable older brother who cares for his sister. He is never quiet at school. He calls boys by their surname (except Sengoku, whom he calls Sengoku-san). He addresses girls with surname plus -san.

Makoto Yasuda Male. 36 years old. 179cm. English teacher at Katagiri High. Extremely inappropriate and insincere. A "pathetic adult" who doesn't even try to hide his desires (mainly his interest in high school girls). However, his lessons are easy to understand. He plays both the straight man and the joker. Students call him by his name without titles and look down on him. He addresses students by their surname.

Koichi Shindo Male. 18 years old. 173cm. Short orange hair. Bright, loud, and a mood maker who enjoys fooling around. He attends a different school than Miyamura and the others (he repeated a year and is a 2nd year again). He has a girlfriend. He was Miyamura's classmate in middle school and claims to be Miyamura's best friend (Miyamura says they're just friends). He was the top mood maker in class during middle school and treated the lonely Miyamura kindly, just like everyone else. He absolutely hates cheese.