Endro~!

Endro! (えんどろ～！, Endoro~!, lit. "End Roll~!") is a Japanese original anime television series by Studio Gokumi. It aired in Japan between January and March 2019, and is currently licensed in North America under a Crunchyroll-Funimation partnership.

Plot
On Naral Island, a hero named Yulia Chardiet ("Yusha" for short) and her party of friends confront the Demon Lord plaguing the Kingdom of Lapanesta. However, their sealing spell goes wrong, and the girls inadvertently send the Demon Lord back in time to before Yusha became a hero. Reverted to the size of a small girl, the Demon Lord, now known as Mao, becomes a teacher at Yusha's Adventure School to expel Yusha so that she'll never become a hero in the future.