Airi's daily commute to work is now by train. She once had an experience with a molester, a memory that continues to haunt her. Yet, determined to move forward, she tells herself, "I'm not the same person I was back then." But as if mocking her resolve, the molester begins to target her most sensitive areas, gradually asserting control over her. Though she resists at first, repeated acts of lewd assault slowly consume her mind. Eventually, she starts to feel pleasure from being violated by the molester, and begins willingly grinding her hips in pursuit of sensation. Every day, she boards the train chasing that pleasure, stepping into a new, twisted routine.