Eight mature women in their fifties and sixties tour the Shimanami Kaido and fall into spontaneous creampie affairs with men they meet along the way. Married couples and partners trade spouses, while a sexless older couple joins unfamiliar couples and a young adult porn crew for swinging. One husband watches his wife surrender to another experienced man and cum repeatedly, then answers his jealousy by pleasuring the other wife with his tongue and fingers before fucking her. Group sex, partner swapping, and travel affairs help the couples rediscover the intimacy they had forgotten.