Yuito, a married woman who cannot be satisfied with her husband who is a masochist who ejaculates prematurely, and Nono, a married woman who is fed up with the persistent sex of her husband who ejaculates late. A couple living next door to each other in a certain apartment were having sex problems. One day, Yuino devises a plan to receive a free accommodation ticket to a luxury hotel from a newspaper solicitor. It's a couple swapping session using two rooms connected by a door (connecting rooms). And on the day they met, the NTR doors of the two couples were connected...