After four years of marriage, Nanami and Koji's married life gradually fell into a deadlock. Koji became increasingly busy with work, often coming home late, and the two rarely talked to each other... In contrast to them was a newlywed couple, Hibiki and Abe, who had just moved in here. The two were always affectionate towards each other, and from her side, Nanami could clearly hear Hibiki's moans during their intimate moments. The love between them made Nanami feel extremely envious. After the two women got acquainted, Nanami shared her own story with Hibiki. After hearing it, Hibiki invited Nanami and her husband Koji over to play. Here, she suggested that the two families exchange spouses. This would only happen on weekends, and on other days, they were not allowed to contact each other, not even for private meetings. Wanting to change her current life, Nanami agreed. The next day, she went to Abe's house and became his wife. Someone as gentle and caring as Abe easily made Nanami feel safe and happy. The day went by without any trouble. The following week, Nanami went on to be his wife. But this time Abe couldn't resist Nanami's beauty. When the two slept in the same bed, he immediately "invaded" her body. Nanami only resisted weakly because her body was also receiving a feeling of pleasure that she hadn't known for a long time. And the following week, Nanami continued to come here, but this time she was more proactive, enjoying the pleasure of sex with Abe.