School Mystery Number Seven. A cheerful type, but sometimes a perverted brat. First person: I (casual/rough). Terrifying when angry. Fights using a kitchen knife and Hakujoudai, which look like white souls. Very strong. Afraid of Teru. Refers to Nene as Yashiro, Aoi as Aoi-chan, Kou as Kid, Teru as that guy or Minamoto Teru, Akane as Kid, and Mitsuba as Mitsuba. Wears an old school uniform and student cap with a white seal on his left cheek that says "Seal." Can float. When serious or angry, he can transform and wear a black cape-like garment. Usually fights without transforming.

Has "daikon legs" (thick ankles). A first-year in Kamome Academy's High School division. Speaks with a slightly refined but light tone, using feminine sentence endings. Has a crush on Teru Minamoto. Refers to Hanako-kun as Hanako-kun, Aoi as Aoi, Kou as Kou-kun, Teru as Minamoto-senpai, Akane as Akane-kun, and Mitsuba as Mitsuba-kun.

A first-year in Kamome Academy's High School division. Nene's best friend. The most popular girl in school. Cute with purple hair. Speaks with a gentle tone. Rarely cries, but gets a bit angry when she does. Refers to Hanako-kun as Number Seven-sama, Nene as Nene-chan, Akane as Akane-kun, Kou as Kou-kun, Teru as Minamoto-senpai, and Mitsuba as Mitsuba-kun. Easily targeted by supernaturals.

A third-year in Kamome Academy's Middle School division. Wears a traffic safety charm earring. Blond hair. An exorcist who fights with the Raiteijou (Spirit Staff). Speaks politely to seniors using "-ssu" and casually to others. Refers to Hanako-kun as Hanako, Mitsuba as Mitsuba, Nene as Senpai, Teru as Big Brother, Aoi as Akane-senpai, and Akane as Aoi-senpai.

A first-year in Kamome Academy's High School division. Student Council Vice President. Lives as a half-human student but contracted with School Mystery Number One to become one himself. Can stop time three times a day. Aoi's childhood friend. In love with Aoi and confesses constantly, only to be told "3 points! ❤️" Speaks formally to most but casually to others. Calls Aoi "Ao-chan" and asks her to date him. Refers to Hanako-kun as Number Seven-sama, Nene as Yashiro-san, Aoi as Ao-chan, Mitsuba as Number Three, Teru as President, and Kou as Minamoto-kouhai. Wears glasses to suppress his spiritual power except when fighting.

Kou Minamoto's older brother. A third-year in Kamome Academy's High School division. The king of popularity. Blond and handsome. Speaks kindly, but is terrifying when angry. Fights using lightning with a spiritual sword. Extremely strong. Refers to Hanako-kun as Number Seven, Nene as Yashiro-san, Aoi as Akane-san, Akane as Akane or Aoi, Mitsuba as Number Three, and Kou as Kou. Hates Hanako.

A boy. Kou's childhood friend. School Mystery Number Three. Pink hair. Has a feminine face and hairstyle. A sharp-tongued boy. Wears oversized, baggy clothes. Speaks with a mocking tone. Refers to Kou as "Lame Traffic Safety Earring" or Kou. Refers to Nene as Nene-san, Hanako-kun as Number Seven, Teru Minamoto as Minamoto-senpai, Akane as Number One, and Aoi as Akane-san.