Three years ago, Reiko divorced and had been living with her beloved dog, Pora, like family. But one day, Pora suddenly went missing. Seeing Reiko heartbroken, her daughter and son-in-law, Shinji, invited her to live with them. Touched by their kindness, Reiko found warmth in their family life. However, Shinji's youthful, vulnerable presence began stirring unexpected emotions within her, making her lose control of her feelings. One evening, after a bath, Shinji appeared before Reiko with his wet body exposed. In that moment, a new passion ignited between them.