Koro-Sensei Q!

Koro-Sensei Q! (also known as 殺せんせーQ!) is a spin-off manga of the Assassination Classroom series featuring the original cast of the original manga. Unlike the original manga, the spin-off is set in an RPG world where Class 3-E attempt to get stronger but lack the necessary skills to fight. Thus, the  Demon King  decides to train them so the class can eventually surpass and kill him with his speed of '99999' (Poking out of the window).

Anime Movie
The spin-off manga is being adapted as an anime film by Lerche. It will feature in Japan on November 19, 2016 along with Assassination Classroom The Movie: 365 days. It is directed by Seiji Kishi and written by Makoto Uezu.