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Yasushi and Yuka, who have both lost their spouses in the past, are brought together by fate and lead a happy life together, blessed with two children. Then one day, their new house, which the couple had painstakingly built together, catches fire due to Yuka's carelessness. Fortunately, no one in the family is seriously injured and Yasushi is relieved, but the shock of the fire causes Yuka to suffer from a neurological disorder called dissociative amnesia, and she is unable to remember even her own name. The doctor tells her that there is no clear cure in modern medicine, which shocks Yasushi, but she accepts Yuka in her current state and decides to walk with her again.
