Iori is a housewife living with a quiet and serious husband. Her husband has always had a bland personality, and both their daily lives and sex life had lost all excitement. Recently, she became close with the wife next door, and they often had dinner parties together. Her husband also seemed to get along well with the neighbor's husband, and the two couples became good friends. One day, while she was having tea with the neighbor's wife, the husband returned home. When the doorbell rang and the wife stepped away, the husband suddenly kissed her. Lacking any excitement in her daily life, Iori was confused, but she didn't dislike it. However, because it was awkward, she intended to keep her distance from the neighboring couple as much as possible. One day, her husband suggested having a dinner party with the neighbors, and Iori couldn't refuse and participated. As the dinner party progressed with drinks, her husband and the neighbor's wife both passed out drunk. As if he had been waiting for the two of them to pass out, the neighbor's husband hugged Iori and gave her a passionate kiss. Then, when the husband showed Iori his rock-hard erection, Iori became uncontrollably excited and sucked it as if savoring it. And through sexual acts that she could never experience with her husband, she reached climax over and over again...