Paper-ronpa , The despair prophecy

In Flipside/flopside , a place between dimensions , there is a School , specially made for the students who are the very bests in their subjects (or) hobbies. We call these students ; the Ultimates. In this story , 16 paper ultimates have been choosed to attend this school. But suddently , after the entrance ceremony of the school , something went horribly wrong , which wasn't a part of the plan.