Shoko Akase is a serious and modest office lady working in accounting, highly trusted by her colleagues. However, one day, a male coworker accidentally witnesses her committing adultery during overtime at the office. Having been interested in Shoko for some time, the man blackmails her, threatening to expose her affair, and forces her to obey his every command, freely manipulating her body. Gradually, Shoko begins to feel excitement as she is treated like a sex toy.