Koro Sensei Quest!
Where to watch in US
Koro Sensei Quest! is not currently streaming in US. Streaming rights differ by country — it may be available elsewhere, so check the other countries below.
A spin-off from Assassination Classroom 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!