Saika and Akagi are dating, but because they work in the same department, they are keeping their relationship a secret. Akagi is a capable, kind person who always cares for Saika. She also imagines the day when they will be together. Chief Takeda knows everything, he has also been interested in Saika for a long time, this business trip is the perfect time for him to take her. There are many bad rumors about Takeda, so Akagi is very worried about Saika. On the contrary, because she has been Takeda's assistant for a year, Saika trusts him very much. And then that day comes. When she goes to dinner with a partner, she is constantly forced to drink alcohol and falls asleep without realizing it. When she wakes up, she finds herself being taken to a hotel by Takeda, and he will be sharing a room with her tonight. Her mind tells her to resist him, but her body has no strength at all. Takeda's strong thrusts made Saika climax again and again, giving her a feeling of pleasure that she had never known before. This feeling gradually invaded her mind, making her forget about her boyfriend who had chosen Takeda for her wholeheartedly. After returning, Saika broke up with Akagi, met again at the company but she only treated her lover with all her heart as a stranger, because now she was devoting both her mind and body to the department head.