"This rule will remain active throughout the Killing Game! For whoever manages to kill Prairie Marble...gets to graduate scot-free! No need to wait for a perfect moment, kill her whenever you like! Kill her in front of her friends and lovers! Bring your kids! Either way, there's NO class trial and NO punishment! Puhuhu~!"
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Among the 17 Ultimates, the protagonist Prairie Marble has no memories of her past, nor is she able to retain the memories of flashback lights. All she knows is that she has memories from when she first awakens from a locker within the Ultimate Academy for Gifted Juveniles.
Something about her is just too odd to ignore, even for an Ultimate, and Monokuma wants to get to the bottom of it. Will Prairie be able to survive the killing game and protect her peers? Or will Monokuma entice murder among them and taint their hearts with despair?