OL Kitamura Shiori, played by Haruna Kawaguchi, hears a message from the wall of her room saying "the person who will be here one year from now" and starts following Hirano Susumu (Issey Takahashi), who lives next door. One day, the mysterious voice suddenly disappears, and the two work together to find the answer to the mystery, and they begin to be attracted to each other...