Ai Mukai works at a mid-sized parts manufacturer, admired by her colleagues for her exceptional precision and beauty. Since joining the company, she has secretly been engaged to her junior colleague, Kimura, but their relationship is discovered by her superior, Naito. Naito feels a deep sense of obligation toward Ai, having mentored her for years, and harbors secret desires for her as a woman. Under the pretext of a new project, he arranges a one-week regional training trip and invites Ai to join. Using Kimura's job security as leverage, Naito pressures Ai into a physical relationship. The unfolding events promise intense drama, humiliation, and emotional conflict.