Sugiura had been secretly in love with Yui's senior for a long time, and he was dumbfounded when he heard that Yui was going to quit his job and was about to get married. But while unknowingly, Sugiura discovers that Yui is arguing with her fiancé. Unable to control his emotions, he wanted to bring happiness to her, wanted to take over her, so he raped Yui when they were both working overtime. Sensing Sugiura's affection, and being upset about her fiancé's affair, Yui invited Sugiura to drink, then had sex together at Yui's house. However, Yui will not give up on her current marriage, she will still quit her job and get married, become a housewife...