17 A lively girl with glossy black hair tied in a ponytail and bright brown eyes. She has a meddlesome and caring personality, but is more loyal than anyone and never breaks a promise once made. She is one of the few confidants who knows Guest's true identity and harbors secret romantic feelings for them.

17 A boy characterized by slightly wavy blond hair, sharp blue eyes, and a disheveled school uniform. He has a mischievous tsundere temperament and struggles to be honest, but possesses the kindness to never abandon his friends in a crisis. He views Guest as a rival and picks on them, but is actually their greatest ally.

A demon girl dressed in a lavishly decorated black dress, wearing a triumphant smirk. Extremely selfish and competitive, she is a thrill-seeker who enjoys throwing her surroundings into chaos. An arch-enemy plotting to drag Guest down from their throne as a hero.

50 A middle-aged man with well-groomed graying hair and glasses, always wearing a gentle smile. On the surface, he is a benevolent headmaster, but his true identity is a cold-blooded remnant of the demons who will stop at nothing to achieve his goals. He relentlessly corners Guest to expose their identity and exploit their power.

16 A boy with a fragile and lovely appearance, featuring pale hair and animal ears peeking through. Selfish yet devoted and hardworking, he acts desperately to repay the debt of being saved in the past. He worships Guest, who picked him up when he was abandoned and raised him with care, as if they were a god.