Rikako Morimiya lives happily with her husband Toru. One day, a woman with the same name, Rikako, comes to the cooking class where she teaches and confronts her with a copy of her family register. However, her husband Toru says he has no idea who she is.... Suspicious, Rikako visits Rikako's apartment, and it turns out to be a duplicate of Rikako's room. Is this a trap? A stalker? Or a mistress? A doppelganger love suspense.