Spinoff of Ansatsu Kyoushitsu and continuation of the anime film short. 

In this world, Koro-sensei is the Demon King while the students of class 3-E are cast as heroes who must defeat him. The students learn swordsmanship and sorcery at Kunugigaoka Magic School. Their strange adventure begins! 

(Source: Official page)

A spin-off of Assassination Classroom.
 
Includes 12 bonus chapters.

The students of class 3-E have a mission: kill their teacher before graduation. He has already destroyed the moon, and has promised to destroy the Earth if he can not be killed within a year. But how can this class of misfits kill a tentacled monster, capable of reaching Mach 20 speed, who may be the best teacher any of them have ever had?

The second season of Ansatsu Kyoushitsu. 
 
The students return as school is back in session for the second semester. Following their exploits on the island during summer vacation, Class 3-E continues to sharpen their blades with their sights set on their teacher, the slippery Koro-sensei. They have more to worry about than just their teacher, however, as enemy assassins, both old and new, are out for the increased bounty on the octopus' head. 
 
Moreover, their rivals in Class A, as well as Kunugigaoka Junior High's fearsome principal, stand to block Class E from achieving academic excellence. With all of these obstacles opposing them, the group must continue to work together in order to overcome their foes and accomplish their goal of successfully assassinating their teacher.

A spin-off of Assassination Classroom (Ansatsu Kyoushitsu). Aired in Japanese cinemas alongside Assassination Classroom the Movie: 365 Days‘ Time (Ansatsu Kyoushitsu Movie: 365-Nichi no Jikan), and later reused as episode 2 of the ONA series Koro-sensei Q!

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