The Magic Tower Librarian

The Magic Tower Librarian Manhua is also known: Demon Tower Librarian / 魔塔の司書 / 마탑의 사서. The Magic Tower Librarian is released in 2018 and you can read it on the website SAWAMICS.COM
– Summary :
Vahlen dreams of being a magician at St. Bright Tower—the greatest institute of magic in the Paula Empire. Too bad he’s just a lowly librarian there… until one day when he stumbles upon a magical book that promises to bring him glory. Now he is caught in an endless cycle of horrific events, doomed to repeat the same days over and over unless he can manage to figure out how to save Princess Elyse and achieve his fated destiny.