Shiori Kitamura (Haruna Kawaguchi) just moved to a new apartment. She works at a company. Susumu Hirano (Issey Takahashi) lives next door to her. He aspires to become a novelist. One evening, Shiori hears a man's voice coming through her wall saying I am in the future 1 year later. The voices asks to trail Susumu. She is unable to hear the man's voice anymore. To solve the mystery, Shiori begins to follow Susumu and she gets attracted to him.