Kento is a guy with terrible dating habits who breaks hearts right and left. Mari is a woman stuck in an affair with a married man. Be it coincidence or fate, they bump into each other in front of a shrine, and that causes their bodies to change in a very unexpected way. They soon realize that they swapped certain parts of their lower bodies, and just like that, their romantic and physical lives change in an instant. Kento and Mari have to navigate their relationships and feelings in their new bodies, while also struggling with the newfound partnership that quite literally has them joined at the hip.