Room 302 in a certain apartment building. Both Mr. and Mrs. Yano were strangely excited. Then, at that moment, the doorbell rang, and Mr. and Mrs. Yano invited in the Asanumas, who lived next door. The reason the neighbors had gathered in this way was to do what is known as wife swapping. "I was really looking forward to today." "Thank you for your cooperation." Two stories of intense swapping sex between neighbors are included! This is resident interaction in the Reiwa era!