"Three Doors"
Three high school students woke up and were trapped in a building from which they could never get out.
There are three dead people locked up here - the teacher who was driven crazy, the isolated student, and another one that no one wants to mention.
Behind every door is a murder without a murderer. They thought they could escape by reasoning.
It wasn't until the last door opened that they discovered——
What's locked inside the door is their own past.
