Nozomi divorced her husband ten years ago and raised Naoya single-handedly. Since she was from a motherless family, she worked hard not to make her feel sorry for her, and before she knew it, Naoya was old enough to graduate from college. Her child-rearing also settled down, and at the same time Nozomi was relieved, she felt a sense of emptiness that she had lost her goal. One day, she was invited to a hot spring trip by Naoya. Nozomi and Naoya set off on a graduation trip just the two of them.
