Because Hinata's husband was much older, the two of them always treated each other like real brothers. Hayato often came to eat at Hinata's house three times a week. However, Hayato's true intention was not simply to eat with his "older brother". He had always had feelings for Hinata, but she did not realize this. Once, when he accidentally asked Hayato if he had a girlfriend, Hayato mustered up the courage to confess to her. Hinata just thought that Hayato was joking and wanted to let it go. A few days later, when he came to get documents from Hinata, Hayato suddenly attacked her. Although Hinata was resisting, Hayato still realized that she was enjoying this very much. And just as he thought, this was the first time Hinata lied to her husband. If she told the truth, everything with Hayato would end, but for some reason she could not do so. And so, she continuously let Hayato fuck her, even Hinata himself took the initiative to seek him out. Her husband also suspected, but because Hinata kept lying, as well as because he trusted his wife too much, the "adulterous couple" continued to have an affair right behind his back...