This is set on a remote tropical island called Jabberwock Island, where they have been marooned by their alleged teacher, a small, rabbit-like mascot named Usami, who claims it to be a field trip. However, the school's principal Monokuma hijacks the trip and usurps Usami’s authority, reducing her to a powerless mascot named Monomi. He then announces the students cannot leave the island unless they participate in the Killing Game.