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...?!