Aimi and her father move into an old, apartment building and learn quickly that things are not normal here. The landlord warns Aimi and her father of the curfew. First, all residents must cross the rope in front of the property by midnight. Second, no one can move out until a new tenant arrives. Those brave enough to break the rules are unmercifully killed by a mysterious force. Aimi begins to see visions of a girl that doesn't exist. She learns that a girl named Ai lived here 30 years ago before she vanished one day on her way home from school. Aimi is driven to find out more about her. She learns that Ai wasn't abducted, but in fact came back to the building the day she disappeared. Can Aimi learn the horrible truth of what happened to Ai? And what is the dark, disturbing secret that the two girls share?