Characters from the game "Danganronpa: Trigger Happy Havoc"

The game was uploaded to Steam in 2010.
It has thousands of reviews and the respond is listed as "overwhelmingly postive"

The game is about a group of high schoolers accepted into an elite school.
However, they are forced to participate in a killing game.
Meaning, if they kill one of the others and get away with it,
they get to leave.

It gained so much popularity it was turned into an anime, and a franchise was born.