Kana is molested during her commute. She tries to push the hand away, but her sexless marriage leaves her vulnerable to the persistent caresses, and her body responds despite the crowd around her. Teased and tormented until she can no longer endure it, she finally begs for release. Repeated forbidden encounters teach her body pleasures and orgasms stronger than the guilt of infidelity. Now she boards the train each day secretly hoping it will happen again.