Miho has retired from her job to become a full-time housewife after getting married. Her husband, Kentaro, is number one in sales and things seem to be going smoothly at first glance, but their sex life has become stale and conversations at home are dwindling. At that time, Kentaro's divorced boss, Toru, remarried Mao, who is two years younger than him. When Kentaro gets tired of Toru bragging about his wife, Toru invites him over to his house, saying, "I haven't been feeling well lately, so come over as a couple." That night, the couple experience mutual NTR. They can't contain their excitement at this first experience in their lives...!! And now they decide to have a creampie orgy with the four of them...