Get ready for a strange but fun-filled adventure with your favorite group of assassins. The killer class is back but this time they've got... magic?! In this brand new spin-off series, follow the chibis of Class 3-E as they learn swordsmanship and sorcery at Kunugigaoka Magic School. Their mission? Defeat the evil Demon King Koro Sensei and face the trials and perils of their magical school!

Source: crunchyroll

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Other: Gekijouban Ansatsu Kyoushitsu: 365-nichi no Jikan
Sequel: Koro-sensei Quest! (2016)