To solve her husband's lack of exercise, the Hoshina couple started running with her husband's business partner, Kayama. The innocent appearance of Ai, who was quickly shortening the distance in terms of time and closeness, stirred up Kayama's long-lost lust. Her body, which had been completely unloved by her husband, tried to resist but was swallowed up by waves of pleasure. Crossing the line, the two continued to run wild. Every time they met, they would sweat with joy...