Anime adaptation of Part 1 of Honzuki no Gekokujou.

When a sickly young girl suddenly becomes obsessed with inventing new things, her family and friends are all puzzled. "What has gotten into Myne?" they wondered, never dreaming that the answer is not a "What" but a "Who": Urano Motosu, a book-loving apprentice librarian who died in an earthquake in Tokyo who somehow found herself in Myne's body! And since Myne's world is still in a medieval stage, where books can only be owned by the elite, the new Myne intends to do everything she can to bring her beloved books to the masses in the time she has left.

(Source: Sentai Filmworks)

Note: The first episode was included in a bonus DVD that came with the limited edition of the 8th volume of Part 4 of the light novel that was released on September 10th, 2019 prior to its TV premiere.