With the end-of-term 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, Shindo informs E Class about A Class's "Big Five", led by Gakuhō's son Gakushu, who are determined to take E Class down. When some of the E Class students go to study in the main campus library, the Big Five propose a contest in which whichever class snags the most top spots in the exams can demand anything from the losing class. While A Class sets their sights on making E Class show complete servitude to them, with Gakushu hoping to find out the class' secret, Koro-sensei proposes his own suggestion of what E Class can ask from their opponents. With both classes determined to win, the stage for the end-of-term finals is set.