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Protected by the highest security, the Maison de Ayakashi is rumored to be haunted, where only eccentrics could live. In reality, it is a place for humans with non-human ancestors to live.

The Shirakiin house's daughter, Shirakiin Riricho, who has a complex about being unable to live independently and unprotected, feels the need to move out and live on her own under the condition of residing in the mansion named "Ayakashi Kan." In this mansion, only those who have cleared a very strict examination could reside in it, and for each resident, they are accompanied with one agent of the Secret Service (S.