Kashiwada Naoki was determined to lead his high school life without anyone knowing that he's an Otaku. However, his classmate Bishoujo, Koigasaki Momo, who was rumored among the girls to be a witch, found out about his secret!? Before the despairing Kashiwada, she said something undoubtedly surprising. "Aren't you an Otaku? Then, make me into an Otaku!" The love story of two individuals bounded by an agreement of Otaku and Riajuu starts!!