As a department chief, Kana is strict and dedicated to her work. One day, she departs with her subordinate Yoshino for an inspection trip to a factory in a rural area. Leaving her husband behind for a week-long business trip, Kana boards a commuter train headed to the lodging facility when she suddenly becomes the victim of a molester. With no sign of Yoshino to help her, the molester begins appearing daily, as if he knows her personally, escalating his actions each time. Unaware that factory workers resent her, Kana is gradually driven to the edge as the harassment intensifies.