The Kamizono household. Home to a long lineage of demon hunters. Kamizono Shinobu and Kamizono Maya — the latest in this long line of demon hunters — return to school one day after finishing a job, only to find themselves in shock. Unbeknownst to them, the school had been turned into a demonic castle in their absence. What could have caused this? And what of the other students? With mysteries afoot and danger abound, only demon hunters have the ability to set things right. The Kamizono siblings fight once again. "When demons lurk near, we demon hunters appear!" "Kamizono siblings, move out!"