Shiori moves into a slightly unusual apartment and makes a fateful encounter with her neighbor Hirano, an aspiring novelist. One day, she hears a mysterious voice in her new room: "I'm talking to you from a year in the future. You're in danger." The voice travels across time and space to save Shiori from being robbed and murdered. When Shiori seeks advice from Hirano, he realizes that a "time paradox" will be caused by her life being saved. It means she will be erased from existence a year later. Shiori starts falling in love with Hirano, who tries desperately to help her, but their days together are numbered.