Kiyotaka is left alone to house-sit while his sister is away on a trip. Though slightly uneasy about living in her upscale apartment, he quickly becomes enchanted by its luxurious surroundings. Watching him delight, Yuko smiles, feeling a deep sense of familial bond. Excited by the spacious bathtub—three times larger than his own—he turns to Yuko and says, "Mom, let's take a bath together." The two then share an intimate mother-son bathing experience. In this unusual setting, far removed from their daily routine, the warmth they share creates a tender, unforgettable moment.