Madam Koi Koi

Accounts vary. Common versions place her origin in a secondary/boarding school context: in some tellings she was a stylish female teacher whose red heels and strictness made her memorable; in origin variants she either died accidentally after being dismissed or was violently killed by students (beaten to death). After death she returns as a restless, vengeful apparition tied to the school site. Sources emphasize variation and do not provide a single canonical origin account.

Most consistent elements are a woman associated with red high-heeled shoes and a teacherly or stylish appearance; some accounts describe her as a former secondary-school teacher noted for beauty and red heels. Visibility varies by telling: in some tales she is fully seen, in others she is invisible except for the heel, and in others her presence is primarily manifested by the sound of her heels.

Legendary behaviors include nocturnal haunting of school premises (dormitory corridors, hallways, toilets), opening doors, singing, whistling, and attacking or troubling students (slapping, frightening, or otherwise tormenting them). Many stories stress the audible heel-click as the signature omen. Some versions report that students who look at her disappear; these disappearance claims are part of the folkloric repertoire rather than documented, systematic supernatural feats. Motive is typically vengeful or punitive, linked to past wrongs or to enforcement of school-time boundaries.