The Kanda couple has been married for 40 years. The wife, Ruriko, is a full-time housewife, and her husband, Yuuaki, has raised two sons together as a couple while busy as a prefectural government employee. Amidst this, their eldest daughter had a child. It is the long-awaited first grandchild. Taking this opportunity, Yuuaki quit his job to spend time with his wife, and while taking care of his grandchild with his wife, he went on a long-awaited hot spring trip with his remaining time... On their long-awaited hot spring trip, they entered a family bath and confirmed the love that had lasted for 40 years.