Nachi Sakaki is a successful career woman thriving in Tokyo. With an outstanding appearance and figure, she always stands out in the office. However, the stress of her busy life begins to build up, and she gradually loses control of her emotions. One day, she uses her subordinate's cock as an outlet for her pent-up sexual desire, satisfying her hidden cravings in the late-night office. When this act is discovered at work, she is summoned by the department chief. Obeying the chief's orders, she begins walking down a path of forbidden pleasure—one that leads to a deep abyss, dragging herself into its depths.