With his wife Keiko hospitalized for treatment, Kenichi is forced to live alone. During this time, Keiko's mother, Sayuri, comes to stay with him. Seeing how messy the house has become under Kenichi's solitary living, Sayuri efficiently helps clean up. Grateful for her efforts, Kenichi begins to feel indebted to her—until an unexpected incident occurs. One day, a large number of used tissues are discovered in Kenichi's room, and Sayuri immediately understands their meaning. However, realizing that her presence is adding strain on her son-in-law during her daughter's hospitalization, Sayuri becomes emotionally overwhelmed, giving rise to a new and complicated tension between her and Kenichi.