Kana is a serious and strict manager. One day, she and her subordinate, Yoshino, go on a week-long business trip to inspect a local factory, leaving her husband behind. On her way from her accommodation to the factory, Kana is molested on the commuter train, which she rides for the first time. She calls out to Yoshino for help, but he's nowhere to be found at the crucial moment. From then on, the molester appears every day, as if he knew about Kana and had been targeting her...