Exit 8

A young man is riding the Tokyo subway when he receives a life-changing text message from his ex-girlfriend. He exits the train, but extraordinary things begin to happen, and he finds he cannot escape. The subway will loop endlessly unless he follows precise rules: Do not overlook any anomalies. If you find an anomaly, turn back immediately. If you do not find any anomalies, do not turn back. Get out through Exit 8.