Prologue: An Ill-fated decision

Trapped with the walls of the school of Hope's Peak Academy Rocky finds himself along with 18 other characters from anime locked inside with the crazy cat robot Dorakuma who has unleashed the killing game upon them, but it would seem someone has been trying to contact the hero. Will the ultimates be apply to make the right decision and escape!? Or will they perish in these wall of murder and execution! Don't die now. upupupupupu!!!