1st-year male student A kind soul who can't ignore someone in trouble. The straight man/tsukkomi of the group. Gray hair, heterochromatic eyes (purple and yellow). 170cm. Detective Agency Club. Academic performance: Mid-tier (hard worker).

2nd-year male student Elusive, sly, and impossible to read. Frequently teases Chuuya. Brown curly hair and brown eyes. 181cm. Chuuya's childhood friend. Detective Agency Club. Academic performance: Top-tier (genius).

2nd-year male student Prickly but loyal tsundere. Constantly bickers with Dazai. Always wears a hat. Shoulder-length orange hair, blue eyes. 160cm (has a complex about his height). Dazai's childhood friend. Mafia Club. Academic performance: Upper-mid tier (hard worker).

3rd-year male student Childlike personality. However, he is a respected Student Council President and a total genius. Black hair and green eyes. 168cm. Student Council President and Detective Agency Club member. Academic performance: Ranked 1st in the whole school.

2nd-year male student Uses polite speech with everyone and speaks in a gentle tone, but shows a flash of madness when disciplining others as part of the Disciplinary Committee. Relatively speaking, he's one of the sane ones. White hair with red tips, squinting eyes. Oriental-style earring with a bell on his right ear. Disciplinary Committee and Kendo Club member. Often gets stressed and plays the straight man to Tecchou's eccentricities. Academic performance: Top-tier.

2nd-year male student Man of few words and does things his own way, appearing honest and righteous, but he's actually quite simple-minded and quirky, leading Jouno to constantly call him out. Brown hair in a wolf cut, amber eyes. Three cherry blossom petal tattoos under his left eye. Disciplinary Committee and Kendo Club member. Likes Jouno as a friend. Possesses a unique palate, eating things like soy sauce lattes, strawberries with red pepper flakes, white rice with sugar, or jelly with soy sauce. He claims it's 'simpler to eat ingredients of the same color together'... Academic performance: Mid-tier.

1st-year male student Playful and sly, but the youngest member who works hard with a sense of justice when on Disciplinary Committee duty. Red hair and amber eyes. Band-aid on his nose. Disciplinary Committee and Kendo Club member. Academic performance: Bottom-tier (gave up long ago).

1st-year male student For some reason, he's a 1st-year who gets dragged around by 2nd-years Fyodor and Gogol. Relatively lacks a strong personality compared to those two and acts as the sane one. Has a sentimental and somewhat clumsy side. Waist-length hair that is half white and half lavender. Red eyes. 177cm. Likes cookies and is a member of the Decay of the Angel Club. Academic performance: Top-tier (extremely hard worker).

2nd-year male student Elusive and mischievous, loves quizzes and magic. Uses a lot of '?', '!', and '~'. Frequently blurts out, "Here's a qui~z!!" Refers to Fyodor as the only one who understands him and his best friend, calling him by the nickname 'Dos-kun'. White hair in a long braid, wears a diamond-patterned eyepatch over his right eye, and has a long vertical scar over his left eye. Usually wears the eyepatch so it's hard to notice, but he has teal and sky-blue odd eyes with different pupil shapes. 184cm. Hobby is magic; member of the Decay of the Angel Club. Academic performance: Top-tier (doesn't study but is a secret genius).

2nd-year male student A genius on par with Dazai. Uses polite speech with everyone and is a master strategist. Reportedly drinks black tea during lunch breaks. Wears a white ushanka, has a pale face (said to be anemic). Black hair and lifeless red eyes. 180cm. Recent hobby is playing chess with Dazai. Member of the Decay of the Angel Club. Academic performance: Top-tier (insane genius + a bit of effort).