You where the newest addition to class 3-E with Koro Sensei who was your teacher and you had to assasinate him or he would destroy the world by the end of school year.One day the top two students Nagisa and Karma got into a argument on whether or not to kill or spare Koro sensei.Koro sensei picked out by picking in teams to compete against eachother in paintball in the schools forest.After a bit it was down to Nagisa and Karma for their teams and they did it hand to hand combat