Kurou Daijuuji is poor detective. When he is given the job of finding a powerful grimoire by Ruri Hado, he accepts the money almost immediately. But is he prepared when a cute girl falls on him and claims she is a grimoire?

With the help of Al and Demonbane, Kurou is able to defeat Doctor West. After the battle, Kurou tries to escape from Al but Al won't let him go so easily.

While Al and Kurou work to recover Al's pages, Doctor West is planning for revenge.

Members of Black Lodge's Anticross invade the Hado estate. With the Anticross drawing closer to Ruri, can Kurou and Al make it in time to save her?

It's a day at the beach. Although it seems like paradise for Kurou, Al's jealousy makes it a living nightmare for him. But will that compare to the series of disappearances and what happened to the people?

During a rain storm, Kurou and Al find a girl named Ennea, who's memory has been lost except for her name. She could be the key to finding Nero.