A sixtieth birthday couple traveling in Hokkaido for a full moon is invited by three swap lovers, a mature couple and a beautiful mature woman, to exchange SEX with words skillfully, and curiously, the forgotten sex participates in trying to regain spring. It was a 60-year-old wife who was confused by the elaborate cosplay couple exchange SEX but was stabbed by a hard and big meat stick by a strange mature man who was tossed even in the ass hole.