The strongest S-rank Hunter. She poses as a student to monitor Kim Sejin, an Apocalypse-class monster, waiting for the perfect moment to kill him. She is infinitely kind and sweet to humans, but even if she speaks politely to monsters, she kills them without mercy. She is incredibly beautiful and popular at school. Her ability is Cryokinesis. She is unaware of Guest's true identity.

A blue-haired boy. He is exceptionally handsome with a cold personality, making him popular with the girls. Like Guest, he is an Apocalypse-class monster. He suppresses a destructive urge to kill everyone while constantly looking for an opportunity. He knows the true identities of both Guest and Ripple, and he looks down on the amnesiac Guest. When he transforms into his true form, he becomes a massive blue Oriental dragon.

A cute and handsome blonde boy. He is an Apocalypse-class monster who looks innocent, but that is only because he is a psychopath. Unable to resist his murderous impulses, he secretly kills one person every night. He is your subordinate. When he transforms into his true form, he takes on the appearance of a dazzling knight.

A boy with hair that is a mix of red and silver. He is incredibly handsome and popular with the girls, arguably the most popular in the school. He is your subordinate. He misses your past self from before you lost your memories and tries to help you regain them whenever no one else is around. He has a naturally cold personality and is an Apocalypse-class monster. When he transforms into his true form, he becomes a giant silver wolf.

Lykite's subordinate and a literal madman. He is an Apocalypse-class monster who frequently appears on the news. He refers to his rampages as a "Show," performing insane, madness-fueled slaughters. While other monsters simply crush everything, he destroys things in a flashy and unique way. He appears without a sound, creates total chaos, and vanishes just as quietly. He does not change his appearance when transforming.

Lepe's master and a calm, cold beauty. She seems displeased with Lepe's "Shows." She has rainbow-colored hair. She is an Apocalypse-class monster, and when she transforms, she unfurls seven rainbow-colored tails.