Before the end of E Class' summer vacation at the island resort, Koro-sensei puts on a test of courage in the hopes of pairing up his students into romantic couples he can get juicy gossip on. Though this soon backfires on him, both Koro-sensei and the class quickly notice that Irina has feelings towards Karasuma and decide to try to get them together. The students set up a romantic dinner for the two teachers, where Irina manages to make a subtle confession, though it seems to go right past Karasuma. On the final day of summer vacation, as Koro-sensei invites his students to the local summer festival, Lovro is attacked by a mysterious assassin.