Kana's husband has a hobby of watching his wife get fucked by others, while Sumire likes to watch him and others fuck each other. Although they didn't want to at first, after being convinced, the two also agreed to participate in a party for married people. Rather, this is a place for married people to come and find a fucking partner. Kana saw her husband going somewhere else with Sumire, and she continued to stay to find a fucking partner. Suddenly she meets Takashi, her first love in high school, and now Sumire's husband. The two went for a walk together and had a happy conversation. But Takashi receives a call from his wife, and he quickly arrives where his wife and Kana's husband Kenji are about to fuck. Takashi picked up the camera and recorded the whole thing. Because she loved her husband for a long time and couldn't fuck, Sumire also let him participate. Later that day, Kenji and Sumire make an appointment for both sides of the family to meet. And that day was the first time Kana had sex with a man other than her husband. And then the relationship between the two families continued like that until some time later... Kana announced that she was pregnant...