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Sure, timid Yuuto Amakawa has his hands (and bed?!) full with his new housemate - the beguiling, sword-wielding cat spirit Himari, who has sworn to protect him from spirits out for his slayer blood! But Yuuto's desire to coexist peacefully with the spirits his ancestors once hunted has a not-entirely-unwanted side effect - his life is suddenly chock-full of beautiful girls! He's got a Lolita water spirit now also freeloading at his place, and he keeps finding himself in the middle of random encounters with gorgeous female spirits of all shapes and sizes. Yup, Yuuto's got it made! That is, until a trip to his late grandparents' house turns deadly...