A wife, Ai, finds herself in a familiar yet tender situation when her husband suggests either dinner or a bath. She chooses the bath, but the moment is interrupted by a new chapter in her life. Her husband, who has been married to her for six years, has never seen her as anything more than a wife. But today, something changes. A message from the neighborhood association brings unexpected news: for the next week, they will be hosting an exchange student, Oliver. A young, enthusiastic foreigner, Oliver arrives with a bow and a greeting, "Oss!" — a sign of respect from his culture. He is eager to learn about Japanese culture, especially the food, and the two quickly form a bond.
As the days pass, Ai and Oliver spend time together, exploring the traditions of Japanese life. From the warmth of the bath to the comfort of the living room, their connection deepens. Oliver is not only curious about the culture but also about Ai herself. The tension between them grows, especially when Ai's husband is away, and the two find themselves in moments of intimacy that go beyond the usual hospitality. Ai feels a familiar heat rising within her — the kind she had felt before, when she was younger and full of life.
On the final night, Ai prepares to return to her home country, leaving behind the warmth of Oliver's company. As they part ways, she is left wondering what the future holds. A month passes, and Ai's life returns to normal — but she can't shake the feeling that something meaningful has changed. And sometimes, in the quiet moments, she still hears Oliver's voice, and feels the echo of a love that was never meant to be forgotten.
