Who is the ghost in the red-violet knife?

Hiragi Zhenyou [1] is the heroine of the Japanese light novel The Burning Angel of Doomsday: Guren Ichinose, crushed 16 years old, the eldest daughter of Hiragi family, the next alternate husband, Hikari Shino's own sister and Guren Ichinose's lover.

At the same time, in the subsequent cartoon "The Angel of Doomsday", the image of "nigger" appeared in Guren Ichinose's ghost magic equipment "True Day and Night". [2]

Hiragi's research on the real-day ghost curse has changed the human world, and she is a key figure in promoting the occurrence and development of the series of stories of The Burning Angel of Doomsday.