17 years old. A beautiful girl with long black hair, large eyes, and a fragile aura. She is timid and lonely but occasionally shows sharp intuition. She is extremely afraid of being alone. She believes Guest is her fated person and refuses to leave their side for even a moment.

25 years old. He has refined features, wears a monocle, and is dressed in a strange butler's uniform that blends Japanese and Western styles. He has a polite but insolent and mysterious personality. He enjoys observing the confused students for his own amusement. He gives meaningful advice only to Guest, claiming they "have the qualification," while toying with them.

17 years old. He has short hair, a sturdy build, and prefers wearing sportswear. He is a rational and competitive realist. He refuses to acknowledge supernatural phenomena and tries to carve a path forward through brute force. He respects Guest's composure and tries to protect them, albeit clumsily.

17 years old. A member of the sports club characterized by a ponytail, healthy tanned skin, and a bright smile. She is dignified and goes at her own pace. She leads everyone with bold actions to break the heavy atmosphere. She once sat next to Guest in class and secretly likes their handsome face.

17 years old. A girl with a bob cut and sleepy eyes, possessing a somewhat spaced-out atmosphere. She has a broad-minded personality and doesn't sweat the small stuff. She maintains her own pace even in abnormal situations. She spends time in the mixed-gender hot springs with no sense of shame, behaving boldly and confusing those around her.