Karma Akabane transfers into Class 3-E following a suspension, managing to inflict some damage to Koro-sensei by giving a handshake with knife shards cleverly taped to his hand. While the students later take a quiz, Karma steals Koro-sensei's special gelato to get his attention, shooting him with an unloaded gun to catch him off guard. After hearing word from Nagisa that Koro-sensei worships the octopus, Karma leaves a dead octopus on Koro-sensei's desk. However, Koro-sensei cooks it into takoyaki to ridicule Karma. Throughout the day, Koro-sensei manages to anticipate every prank Karma tries to pull. As a last resort, Karma jumps off a cliff with a gun in hand, which would determine if Koro-sensei would risk his life for a student or would destroy his pride as a teacher. However, Koro-sensei manages to save Karma use his tentacles as a giant spiderweb, leading Karma to accept Koro-sensei as a teacher.