In the land of Naral Island, a land of magic and swords, humans and monsters live together. Once upon a time, there used to be a terrifying Demon Lord, but long, long ago the first Hero defeated the Demon Lord. The Demon Lord would revive again and again throughout the ages, but every time a Hero would appear to defeat it… Now these young girls attend an Adventurer’s Academy to prepare them to defeat the Demon Lord that will one day rise again. This is the beginning of a laid-back fantasy life with no sign of the Demon Lord for these four who hope to become a party of heroes. – Crunchyroll
Streaming: Crunchyroll and Funimation
Episodes: 12
Source: Original
Episode Summary: Yulia, the hero, and her three companions soundly defeat the Demon Lord, sending them into a prison of time and space. The world is saved! … or so it seems. In truth, the magic spell that sealed the Demon Lord was a fluke with accidental consequences, sending the near-powerless enemy back in time several years before the final conflict.
The Demon Lord finds her way to Yulia-and-company’s hero school to nip the whole adventuring party thing in the bud before it becomes a problem for her. The issue is that, while the heroes aren’t very competent yet, they seem to have a talent for being lucky. That alone may be difficult for a very small Demon Lord to overcome.