Akumu No Elevator

Four different people are stuck in the elevator. Everyone of them have a different reason for being in the building. To pass the time three guys and a girl decide to play the game of "truth". Each of them tells their most terrible secrets. That's how the main hero finds out that he's actually stuck with three real criminals, though he himself also hides something. The reason why he is in the building is the fact that he is having an affair with his co-worker being married and having his wife pregnant. Spitting out the truth about himself, the main hero realizes that there is no way all of them could be on the same elevator at the same time with no cell phones working...