Starting off the Winter 2017 simulcasts is a team-up between Crunchyroll and FUNimation, Koro Sensei Quest. There is currently no announced dates or regions but Crunchyroll will have the series subtitled and FUNimation will have English dub. The spin-off of Assassination Classroom has been running in Saikyou Jump since October 2015 written by Kizuku Watanabe and art from Jou Aoto. The series airs in Japan starting December 23 and will feature 12 episodes each 10 minutes long. Crunchyroll describes the series as:
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!