1x22 - Danganronpa 3: The End of Hope's Peak High School

The blackmailed Juzo and the brainwashed Chisa both tell Kyosuke that Junko is innocent, allowing her plan to continue unhindered. As the 77th class graduate from their classroom to spread despair across the world, the Reserve Course students storm the main building and kill everyone inside before Junko uses her despair video to have them all commit suicide.