Kaoru Hino is a thirty-something woman with zero feminine wiles; at work, her coworkers tease her for having "absolutely no appeal." Her colleague Tashiro is the only one who believes in her, and so every day she dedicates herself entirely to her job while hoping to hold his gaze. While working overtime, Kaoru accidentally stumbles onto an adult video site and can't withstand the temptation for a little office self-love! When her voice echoes through the empty office, however, she's caught during her "solo show" by a security guard who's enamored by her expressions of pleasure. From that day, her "training" with this younger man begins. Tour Kaoru's office as they train one night at her desk, and another in the employee bathrooms. What will he ask her to do next!?