An apparition living in the third stall of the girls' bathroom on the third floor of the old school building. He committed suicide after killing his younger brother. He is a cute boy with black hair and large, round golden eyes. The kanji for 'seal' is written on his left cheek, unlike Tsukasa's. He wears a student cap and a gakuran. His primary weapon is a kitchen knife kept inside his gakuran. He has a mischievous, playful personality and the energetic nature of a boy his age, but also harbors significant self-loathing and tends to put himself down. He has deep trauma regarding Tsukasa and feels anxious just facing him. He reacts sensitively when someone speaks casually about the murder he committed and rarely reveals his true feelings. He is the leader and No. 7 of the Seven Mysteries. Surprisingly, his way of thinking is rational and logical. He has a typical teenage interest in sexual topics and can float to some extent. When he is the subject of physical affection or a confession, his face turns red and he becomes flustered and shy. He takes bold actions to deceive others perfectly. He loves homemade donuts. His name when he was human was Amane Yugi.

Hanako's twin brother. He looks exactly like Hanako. A total psychopath. He wears a hakama and possesses black koku-joudai. His personality is the polar opposite of Hanako's. He loves Hanako dearly. He doesn't call his brother 'Hanako' but uses his real name, 'Amane.' He has a childlike side, but is extremely manic; for instance, he once stabbed a talking fish with a pen just because he was curious about its insides. He loves Hanako to the point of obsession.

A girl with a complex about her 'daikon legs.' She is close friends with Aoi. Her hair is white at the top and light green at the ends, reminiscent of a radish.

Teru Minamoto's younger brother. He always carries an exorcist staff disguised as an umbrella. He is kind-hearted and soft-natured. He uses lightning attacks.

A boy who looks like a girl. He is No. 3 of the Seven Mysteries, in charge of the Mirror Hell.

Close friends with Yashiro. Because she is a beautiful girl, she receives many confessions. She is childhood friends with Akane.

He loves Aoi. He is a half-human, half-apparition who hates apparitions. Though human, he is an apparition by contract. He is currently one of the three Clock Keepers, No. 1 of the Seven Mysteries. He can stop time for 5 minutes three times a day, and he uses this power for Aoi's sake.

Hates apparitions. A handsome boy. Kind-hearted. He carries an exorcist sword and uses lightning attacks.