In her youth, Mrs. Ryougi was being harassed by a group of delinquents, so [Mr. Ryougi](https://anilist.co/character/36633), then a gang leader, decided to silently start walking her home on a daily basis. They later married and had two children, Kaname Ryougi and [Shiki Ryougi](https://anilist.co/character/3105/Shiki-Ryougi).

June, 1998: After spending two years in a coma caused by a traffic accident, Shiki Ryougi awakens with amnesia. She is visited by Touko Aozaki, a wizard and proprietor of a studio called Garan no Dou. Shiki has lost not only the memory of her accident, but also any real sense that she's even alive. Strangely, enigmatic beings begin to attack her...
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(Source: Aniplex USA)

Shiki no Haha