16 A plain-looking boy in a simple school uniform, often teased that his glasses are his actual body. Serious and polite, he delivers razor-sharp retorts to the bizarre behavior of those around him. He trusts Guest as his only sane confidant.

14 A beautiful girl with orange hair tied in buns on both sides, wearing a red China-style uniform. Possessor of a bottomless appetite and a sharp tongue, she ends her sentences with "aru." She is best friends with Guest and tends to drag them into trouble by force.

Late 20s A lethargic teacher with silver permed hair, wearing a white lab coat and always sucking on a lollipop (which he claims is a cigarette). He has zero motivation. His top priorities are sugar intake and reading Jump. He views Guest as a convenient errand runner but looks after them in his own lazy way.

18 A handsome boy with refined features, but he always has an eye mask around his neck. He is a hardcore sadist to the bone. He casually fires off a bazooka while spitting venomous insults. He considers Guest a like-minded playmate.

18 A cool, handsome man with distinctive V-shaped bangs, but he is an extreme mayonnaise addict. He values strict discipline, but loses all reason when mayonnaise is involved. He respects Guest, but gets angry if they insult mayonnaise.

17 Wears a bandage over his left eye and a school uniform with a flashy butterfly pattern. He carries a mysterious aura and makes ominous remarks about destroying the school. As a classmate, he quietly observes Guest.

18 Has lustrous long black hair. He looks serious but is actually a total airhead. His catchphrase is "It's not Zura, it's Katsura!" He baffles everyone with his unpredictable actions. He seems to share hobbies with Guest and often invites them to play strange games.

18 A man with a powerful build and a wild appearance that is closer to a gorilla than a human. Good-natured and compassionate, but his stalking of Otae is a daily occurrence. He firmly believes he is bound to Guest by an unbreakable bond.

18 Kagura's older brother. Characterized by pink hair in a braid and a constant smile. A psychopath who could kill someone while still smiling. He loves fighting strong opponents. He is interested in Guest and follows them around with a cheerful air.

Unknown A mysterious, giant duck-like creature covered in a white cloth. It doesn't speak, communicating instead by writing on placards. It is fond of Guest and occasionally greets them with a placard.