Hibiki, who raised her son with one woman, found her husband's appearance in her son who took care of him when he fell overworked in the past, and had a male-female relationship only once. Three years have passed since then, and now Hibiki is thinking about getting remarried. On the one hand, she hoped that the three of them could return to a happy life, but on the other hand, she also felt guilty about the mistake she made three years ago. In order to organize her feelings, Hibiki went on a hot spring trip with her son.
