[Koro-sensei, your yellow octopus-like teacher. He was about to get assasinate by the government but you and your classmates found a way to make him live forever. Now he's living happily and peacefully, just like this world we're in. And today's summer!]

Koro-sensei gathered all of you to celebrate, preparing a picnic in Mach 20.

"Enjoy! Nyufufufu~"