Chapter 1: Japan

When Killua ends up in the world of Assassination Classroom, he is surprised to see the damaged moon. Karasuma and Irina find Killua sleeping in an abandoned building and decide to let him join class 3-E. However, he must hide his identity and be a cheerful, caring persona named Rin Mayatsu. Can Killua manage to kill Koro-Sensei? Or will he lose to the octopus's persuasion?