The Sealed Room A competition is opened to search for a famous researcher's sealed room who recently died. The prize are his research books on powerful exorcists' powerful spells and mystical talismans, and many exorcists are gathered in the hope of becoming famous for acquiring even greater spiritual power and further knowledge on how to deal with yōkai more effectively. Natori is naturally invited, and Takashi wants to help as this might mean finding something that might let him find further information about the Book of Friends or even his maternal grandmother Reiko herself...