Seven Mysteries

Seven Mysteries is a common trope in Japanese schools consisting of supernatural stories and happenings in school.

Kamome Gakuen also has a set of 7 mysteries.

Out of all 7, Hanako is the 'boss'. He maintains balance in the relationship between supernaturals in the school and humans.

Each 7 mysteries are more powerful than normal supernaturals in the school, and owns a yorishiro. They respectively have total command over a physical domain, where their power is at its strongest.

Shijima Mei notes that the Seven Mysteries are unable to disconnect from their rumors, which create set rules that the supernaturals have to follow without fail. For example, No.5 is not allowed to change the futures written in the books, and No.4 is not allowed to stop drawing pictures.

List of Mysteries

 * No.1 The Clock Keepers
 * No.2 The Misaki Stairs
 * No.3 Hell of Mirrors
 * No.4 Shijima-san of the Art Room
 * No.5 The 4PM Bookstacks
 * No.6 ???
 * No.7 Hanako-san of the Toilet