Bye Bye, Big Bad

Bye Bye, Big Bad is the twelfth and final episode of Koro-Sensei Quest!.

Overview
The day has come to finally fight the Big Bad. Will Class E be able to kill him?

Trivia

 * Korosensei was singing his own version of Tabidachi no Uta during the graduation.
 * Kayano expresses confusion on seeing Aguri in the dungeon. This is most likely an allusion to the canon series in which Aguri is actually deceased.