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