On her daily commute, Yui Hatano offers her seat to an elderly man, unaware that this simple act will plunge her life into terror. The old man, mourning his deceased wife, becomes obsessively fixated on her. Mysterious gifts begin arriving at Yui's home, and on the train, she feels an unnerving presence closing in behind her. As fear and anxiety grow, her body is mercilessly violated by the man's lewd fingers and tongue, leaving deep emotional and physical scars.