The "Roman Club," a school group interested in the occult, to which he's practically enslaved, has become boring for one Hideo Aiba. Until a girl named Kurumi Sahana shows up and wants to join up. But Sahana is no ordinary girl... When the two are left alone in the club classroom, Kurumi makes a special "request" of Hideo... From that moment on, Hideo's dull life gets far more...frustrating.