[Ishimaru has a distant look in his eyes, like he's mentally somewhere else. Back in the halls of Hope's Peak... He recites an answer almost robotically.]

Once a murder takes place, a class trial will begin shortly thereafter. Participation is mandatory for all surviving students.

If the guilty party is exposed during the class trial, they alone will be executed.

If the guilty party is not exposed, they alone will graduate, and all remaining students will be executed.

Those are the rules... of the killing school life...