Koichi is the son of the owner of a famous company, Tabuchi. Although he is about to turn 30, he is always lazy, refuses to work, and only stays at home holding his phone all day. Worried that his son would lose his wife, and partly hoping that Koichi would change after marriage, Tabuchi decided to match him. The target he targeted was Nao, the daughter of the head of the partner company. Having such a beautiful girl as his wife, Koichi naturally came out happily. Nao didn't want to, but in the face of Tabuchi's power, she had to agree. He also asks Nao not to fuck anyone, including Koichi until they get married. A year later, Koichi and Nao finally get married. That night, Koichi was eager to "move" with the beautiful bride, but he was too worried to get an erection. The next day, Koichi had to go on a business trip for five days, leaving only Tabuchi and Nao at home. She quickly returned to her room and masturbated herself, wishing to relieve her long-accumulated sexual desire. But she didn't expect that all of them were captured by the cameras that Tabuchi had installed before. In fact, their marriage was just a plot so that he could take over Nao, turning her into his "wife". On the day Koichi went on a business trip, he gradually trained and taught Nao to become a lewd daughter-in-law, always craving his cock, ready to let him fuck even though Koichi had returned...