Riri Okamoto, a new employee who has just finished her orientation, is a serious but shy girl. She struggles in her sales training and prefers a clerical position. Her boss, hearing this, suggests she join his department, which she agrees to. As she signs the paperwork, she suddenly feels an overwhelming sleepiness and passes out. When she wakes up, she finds her boss giving her a blowjob! It turns out the document she signed was a contract agreeing to become his "sex slave" - a subordinate who fulfills his sexual needs. Her H-cup breasts, visible even through her suit, are squeezed and her nipples are teased with his cock. Of course, this leads to an unpermitted creampie! After a thorough training session, she'll be tasked with entertaining a client... There's no way out of this contract, being a sex slave is a binding agreement!