Chiharu has landed a job at a top company and is so busy that she has yet to answer her boyfriend's proposal. He plans to give her a ring and propose again on her birthday, but Chiharu crosses the line at the office with Odagiri, a coworker who has feelings for her and often works late alongside her. Her extreme sensitivity leaves her cumming violently again and again as his cock drives deep. Overwhelmed by pleasure, she forgets her boyfriend, sucks Odagiri off at the office, then heads to a hotel for cheating sex and even more orgasms. As she ignores her boyfriend's calls and his anxiety grows, the affair becomes a brutally heartbreaking NTR story.