The Izumi couple has been married for 27 years. The wife, Ryouko, used to work as a nursery school teacher but is now a full-time homemaker supporting the family. Her husband, Yasuo, works as an engineer at a major construction company and has led a busy life. Despite their hectic schedules, they have worked together to raise their children. Yasuo now has only three years left until retirement, marking a turning point for major changes in their lives. Recently, their eldest daughter, Chie, gave birth, bringing them their long-awaited first grandchild. Inspired by this joyful event, the couple decided to reconnect and discuss their future, embarking on a long-overdue hot spring trip. As they soak in the warm waters, memories of their youth come flooding back, rekindling the bond between them as a mature couple and leading to heartfelt moments shared after a long time.