Yuuto wird zu einer Versammlung von Oni-Tötern ins Anwesen der Familie Tsuchimikado eingeladen. Dort ist man der Meinung, dass Himari für Yuuto eine Gefahr darstellt, und versucht, die in Himari schlummernde Bestie hervorzulocken ...
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...
Haruomi awakens to the power of the Ring of Solomon and decides to take up the role of Annihilator in the Seventh Gospel Organization, a society of demon hunters, in order to grant Zilch her wish. Under orders from the organization, Haruomi and Zilch begin a covert investigation to find a new "branch" at Kanmeikan High School, where they're joined by none other than Murohime. What adventures await them there...?!
Haunted by the untimely deaths of his mother, little sister, and a childhood friend, listless high schooler Haruomi Io has trouble engaging with anything or anyone. Of course, that doesn't mean others have trouble engaging with him-a fact he discovers to his dismay when he finds himself the target of a trigger-happy group calling themselves the "Seventh Gospel Organization." Having newfound enemies may be rough, but Haruomi's unexpected ally in the form of a demoness calling herself Zilch may turn out to be even more of a handful...Still, there's something to be said for a dose of the supernatural (and more than a few buxom girls) when it comes to casting off the doldrums!