Office lady Rio is troubled daily by molestation on her commute train. The culprit is her superior, Department Chief Abe, who always kindly listens to her concerns. At first, she didn't realize it was him, assuming their strained relationship was purely professional. But from one day onward, Chief Abe began deliberately approaching her, increasingly demanding sexual contact. Initially confused, Rio gradually becomes aware of how intensely pleasurable the acts are and how powerfully they attract her. As their relationship deepens, Rio gives in completely, surrendering herself to Chief Abe's advances with a mindset of reckless abandon.