Koro Sensei’s lessons in verbal defense are put to the test when Karma must use his brains instead of his brawn to rescue a classmate. Then things finally begin to go smoothly for the students of 3-E. Everyone receives some good news about their futures, and Nagisa settles on a career goal.

But the peace is broken when the world’s nations miraculously manage to coordinate their efforts long enough to launch a plan to assassinate Koro Sensei—with the aid of the strongest mercenary in the world and an ultimate weapon! Will anyone break ranks to protect everyone’s favorite tentacled teacher…?