So if they vote for the wrong culprit, they die? That sounds... rather original, if not a waste of detectives.
Everyone dies, except for the real culprit. The culprit who gets away with murder gets to leave scot-free.
What!?I don't want to die!That's wrong!Please stoooooo-Please help us, headmaster!Graduating by myself is lonely...So you're the culprit, Kuwata!Wait!But too bad! Kuwata is not the villain.That 11037 on the wall is the culprit's name, left by Maizono!Well, it seems you've all voted for Kuwata.This game is too hard! Let us out!