Batsuichi Ningyo, Koi ni Oboreru.

After ten years of marriage, thirty-two-year-old Mizuho finally walks away from her husband when his infidelity comes to light. Seeking refuge, she begins the journey back to her parents' home, but an unexpected detour by the sea changes everything. There, she spots a man struggling in the water and slowly drowning. True to her deeply ingrained sense of responsibility and natural leadership, Mizuho cannot simply walk away. She throws herself into the rescue without a second thought for her own safety, only to find herself pulled under the waves instead. When she regains consciousness, Mizuho discovers that she is no longer on the beach. She has been taken in as a guest at a boarding house operated by the very man she nearly died trying to save. For a serious, straightforward woman who has always felt profoundly uncomfortable around men, this sudden proximity to a stranger presents an entirely new kind of challenge. Still reeling from the betrayal that ended her marriage, Mizuho must navigate unfamiliar surroundings and her own guarded emotions. What begins as a chance encounter in the ocean soon blossoms into the start of a mature romance she never anticipated.