With the final exams approaching, Koro-sensei offers an incentive, in which each student who gets the best overall score in their top subject will get to shoot off one of his tentacles during their next assassination attempt. Meanwhile, Shindō informs the students of Class 3-E about Class 3-A's Big Five (Gakushū Asano, Teppei Araki, Ren Sakakibara, Natsuhiko Koyama and Tomoya Seo), who are all determined to take Class 3-E down. When Nagisa, Manami, Yukiko, Isogai and Rio Nakamura go to study in the main campus library, the Big Five proposes a contest, stating whichever class snags the most top spots in the exams can demand anything from the losing class. While Class 3-A sets their sights on making Class 3-E show complete servitude to them, Koro-sensei proposes his own suggestion of what Class 3-E can ask from their opponents. With both classes determined to win, the stage for the end-of-term final exams is set.