Morimiya Rikako enjoys a fulfilling life with her spouse, Toru. One day, during a cooking class where she teaches, another woman named Rikako appears and, while presenting her family register, mocks, "My husband is Morimiya Toru, and you're his lover." Confused, Toru claims he has no knowledge of the situation... Feeling uneasy, Rikako decides to check out the other Rikako's home, only to discover it resembles her own room eerily closely... Is this a setup? A stalker? Or perhaps a rival? A suspenseful tale of doppelganger romance unfolds!