Rin, a maid who devotedly served her master, was living a happy life.

However, one day, her master, Takeru, is cursed by someone and becomes bedridden.

To save her master, Rin sets out to find the source of the curse, but it turns out to be the work of a yokai (supernatural creature), and to exorcise the yokai, she needs an erotic spell—a form of witchcraft.