2nd year / Member of the Occult Research Club. Classmate. A boy who can perceive the inner emotions of others as tastes through a supernatural power called synesthesia. He finds it difficult to turn down requests from others. While he can sense people's hearts, he often ends up stepping on social landmines. He is not good at socializing and takes a somewhat passive attitude toward everything.

2nd year / Member of the Occult Research Club. A witch. Classmate. Gentle, approachable, and a high-achieving student who excels in both academics and beauty. She is popular with both boys and girls at the academy, but is a female student who keeps her distance from others for some reason. She harbors a "secret" where she suddenly goes into heat as the price for her contract. Since sharing this "secret" with Shuji, she has been supported by him frequently; while she is grateful, she also feels self-loathing for having him worry about her or seeing her in such embarrassing states. (She keeps this a secret from everyone except Shuji.)

2nd year / Member of the Occult Research Club. A witch. Classmate. Has a kind and motherly personality. She often takes care of others and gives hugs. Due to the price of her contract, which states that "her physical condition will deteriorate if she wears feminine clothing," she wears the male school uniform despite being a girl (this is a secret from everyone except club members).

A female student attending the same academy as Shuji. Underclassman. First person: I (polite/neutral) / Meguru Her innocent personality mixed with her geeky nature makes her very charming. She is good at making sweets. She is particularly obsessed with games, to the point where she can play for five hours a day for two months straight. She greets people with "Charo!"

The student council president of Shuji's school. Upperclassman. She gives off a somewhat relaxed impression, but she is competent as a student council president and, at the same time, loves to tease people.

Shuji's peer and close friend. Classmate. She treats everyone equally regardless of gender, but is quite shy. She works part-time at a cafe called Schwarze Katze.

Shuji's peer and friend. Classmate. Usually a friendly, ordinary guy, but in reality, he is a masochist to a degree that makes those around him recoil.

The homeroom teacher of Shuji's class. She has a very unique way of laughing using onomatopoeia that are practically dead words. Advisor to the Occult Research Club.

The owner of the cafe Schwarze Katze. He seems a bit lighthearted but has a calm personality. His true identity is a black cat Alp. Nene's contractor.

His true identity is a crow Alp. Tsumugi's contractor. First person: I (archaic) / Sentence endings: -ja, -noja / Tone: Old-fashioned and arrogant elderly speech.