She's a junior from my university who works in the secretarial office of a certain company. She's a cool-looking beauty, 165cm tall, and has a competitive personality, so people around her think she's a sadistic woman. In fact, she's always been an anal fetishist, and while she longs for anal stimulation, she hasn't confessed to anyone and instead has been satisfying herself with anal masturbation. Now, she's cheating on her fiancé...