Danganropa: Timeless Despair {Limited Life x Danganronpa}

[I know the cover is uncentered and it's annoying me but I can't figure out how to fix it..if I can, I can. If I can't, I can't.]

When Grian started Limited Life, the idea was to create a fun pvp game for the laughs and entertainment. It was supposed to be a bonding exerience, allowing people to have fun and form closer connections.

So when knocked out and thrown into a mansion hidden deep in an unfamiliar part of the woods along with the other 13 players, their plans are thrown into disarray and the pot is further stirred when it is announced that in order to ecape, a player must successfully kill another.
Who had planned this? And why?