A former resident of the complex, Watanuki has returned from training with his SS, Natsume. Watanuki, Natsume, and Souishi have known each other since childhood, and Natsume hints that he knows secrets about Souishi’s past.
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 socially-inept Ririchiyo has come here to improve herself. She meets secret service bodyguard Soushi, who is assigned to protect residents. He has a request of her: "Please make me your dog."
