http://tvtropes.org/pmwiki/pmwiki.php/Laconic/DanganRonpa
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Several high school students considered the best in their respective fields are locked in a school with a Killer Teddy Bear mascot, who forces them to kill each other and get away with it if they want to escape. Murder, minigames, and extremely elaborate executions ensue.
Alternatively: If Total Drama, Battle Royale, and Ace Attorney were made even crazier and combined into one Visual Novel Franchise, this would be it.