Natsuki Takeuchi and her husband are saving up to buy a new house, so Natsuki also decided to work to help her husband in any way she can. Natsuki chose a company that is a client of her husband to apply for a job there, so she could conveniently assist her husband at work. One day, Natsuki faced difficulties at work; being new, she was still quite inexperienced, and her boss called her to inform her of a mistake she made that caused a loss for the company. However, it was actually a trap set by her boss, who had a secret interest in Natsuki, fabricated to coerce her into becoming his mistress.