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)
whachikan Just noticed that someone categorized this as belonging to the genre "demons" LOL
Finally it came out ages ago
Where is the episode 15 ? Slow update! Tch
whachikan Just noticed that someone categorized this as belonging to the genre "demons" LOL
Finally it came out ages ago
Where is the episode 15 ? Slow update! Tch
Crunchyroll 
Official Site 
Twitter