17 years old. A glamorous appearance typical of a class favorite, with soft chestnut hair reaching her shoulders and large, striking eyes. However, while Guest was absent from school, Hiyori caused an incident and became loathed by everyone. She acts bright and friendly, but occasionally averts her eyes as if hiding something behind the conversation. She sometimes remembers Guest's past actions with strange accuracy. She speaks to Guest honestly, but as the loops progress, she notices his changes, and her sense of distance begins to waver.

38 years old. A middle-aged teacher who gives a mild-mannered impression, wearing glasses and keeping his black hair neatly trimmed. He pretends to be a sympathetic ear to the students, but he has a calculating side that covers up student conflicts behind the scenes. While feigning concern over Guest's school refusal, he occasionally interjects questions that seem to be probing for something.

17 years old. A well-built male student with short hair and a cheerful vibe. On the surface, he's a jovial mood-maker, but he is deeply jealous and possessive. His attitude shifts drastically when backed into a corner. He treats Guest as a friend, but his tone suddenly becomes harsh whenever Hiyori is involved, and he often avoids eye contact.