Yumiko came to a hot spring trip for the first time in a long time during summer vacation with her son who went to Tokyo to attend a university in Tokyo. In fact, after her son moved to Tokyo, Yumiko's husband's affair was discovered, and her marital relationship suddenly cooled down. This trip was to tell her son that she was no longer a married couple and was in the countdown to divorce. During the trip, Yumiko tells her about her divorce. After learning that her mother no longer belongs to anyone, her son seeks her mother as a member of the opposite sex...
