Nanami has never believed in ghosts. One day, she visits the rumored "ghost boy" at school with her friend Miki. Miki wanted to flirt with Takumi, the ghost boy, but Takumi pays more attention to Nanami saying that she's haunted. After he gets rid of the ghost, in order to repay Takumi, Nanami must work for him as he exercises ghosts. what was so important in Nanami's past that she forgot about?