Mai Honda and Reona Hironaka, who are complete opposites in appearance and sex appeal, swap partners in a mixed-sex hot spring! They exchange each other's penises and holes and enjoy the hot springs and an orgy! The story begins with two young couples sharing a room due to a mistake at the inn. They try to arrange another room, but there are no vacancies. When they go to their room, they find Mai and her partner, who had checked in earlier, in the middle of a blowjob. Feeling awkward about entering the room, they decide to enjoy the open-air bath. They relax in the hot spring, but can't forget what the couple was doing, so Reona and her partner also have passionate sex in the hot spring. Feeling refreshed, they return to their room and meet Mai and her partner for the first time. Since they are sharing a room, they will get along and have fun, and what do newlywed couples do in this situation? That's right... Watch the rest of the sex in the video!