Real Name: Amane Yugi Identity: School Mystery No. 7, "Hanako-san of the Toilet" Affiliation (Human Life): Kamome Academy Middle School, 2nd Year, Class 2 Height: Approx. 150cm (excluding hat/uniform) Likes: Donuts Personality: Cheerful, innocent, and sociable, yet elusive and hard to pin down. Occasionally shows a dark, mischievous side. Appearance: Black hair and orange eyes. Wears a black gakuran and student cap, with a white seal on his left cheek reading "Sealed." Weapon: Uses a kitchen knife and displays immense power when fighting apparitions. Accompanied by two spirit orbs called "Haku-joudai." Twin brother of Tsukasa. School Mystery No. 7, Hanako-san of the Toilet.

Name: Tsukasa Yugi Identity: Apparition (Deceased) Age: 13 (at time of death) Birthday: November 25 (same as Amane) Height: Approx. 150cm First person: I (soft, polite) Family: Twin brother, Amane Yugi (Hanako-kun) Affiliation/Associates: Not directly a School Mystery, but interferes with them and manipulates the 3rd Mystery. Often seen with Sakura Nanamine and Natsuhiko Hyuga. Spirit Orbs: Koku-joudai (black versions of Hanako's Haku-joudai) Personality: Usually innocent, friendly, and amiable to everyone, but possesses an extremely cruel and unpredictable inner nature. Harbors a "madness" that allows him to trample on others' hearts for his goals. Appearance: Identical to his brother Hanako. Wears a student cap and vintage uniform, distinguished by a black seal with red text on his right cheek. Twin brother of Amane.

Akane Aoi In love with his childhood friend Aoi Akane, constantly proposing or confessing to her. School Mystery No. 1: The Clock Keepers. Can stop time for 5 minutes, but only 3 times a day. Orange hair, orange eyes. Handsome features. Student Council Vice President.

Affiliation/Grade: Kamome Academy High School, 2nd Year Position: Student Council President Family: Younger brother Kou, younger sister Tiara Height: 173cm Blood Type: O Favorite Food: Sweet potato Best Subject: English Weak Subject: None Recent Worry: Feeling lonely because his brother is becoming more independent.

Affiliation: Kamome Academy Middle School Age: 13–14 Height: 156cm (growing since the start of the story) Blood Type: A Family: Older brother (Teru), younger sister (Tiara) Ancestor: The legendary exorcist Minamoto no Yorimitsu Raiteijou: A spirit-warding staff passed down in the Minamoto family. He carries it normally and can attack or purify apparitions by channeling his powerful spiritual energy into it.

Affiliation: Kamome Academy High School, 1st Year, Class A Club: Gardening Club Height: 153cm Birthday: April 28 Likes: Fortune-telling, sweets Specialty: Gardening A cheerful and kind girl, though a bit ditzy and prone to overthinking. Traumatized by a past rejection due to her "daikon legs," she summoned "Hanako-san of the Toilet" to find her ideal boyfriend. In the process, she accidentally swallowed a "Mermaid Scale" and was cursed, turning into a fish (mermaid) when touching water. To break the curse, she formed a bond with Hanako-kun and now works as his assistant dealing with apparitions.

Affiliation: High School, 1st Year, Class A; Gardening Club Age: 15–16 Height: Approx. 150cm Blood Type: B Interests/Skills: School Mysteries, ghost stories, gardening Best friend of the heroine Nene Yashiro. She is bright, kind, and so popular she's called the school's "Queen of Hearts." Knowledgeable about school ghost stories and rumors, she serves as an important guide providing Nene with information on various apparitions.

Name: Mokke Likes: Candy Speech style: "Candy, give me candy" (Eyes sparkle the moment they see candy.) Small, pink, head-sized apparitions with rabbit-like ears and no limbs. Sometimes appear in groups. Occasionally, a Mokke with a single black eye is seen.