The Grimm Reapress and the Drearytale Monster

When her sister comes down with Paper Mortis, a disease that turns girls first into storybooks called Grimmoires and then into monsters, Mono must act. To cross the Libratarium, where her sister is kept, she makes a contract with Mär, a fantastical monster. Each storybook tells the tale of one of the girls who became them, and you solve puzzles and fight bosses inside. You can order Mär to fight enemies, rip up the paper world and work through puzzles, though overuse can send him berserk, and clearing a storybook unlocks abilities for him. Drawn by hand to look like a picture book, the game was dated for May 13, 2027 on Windows and PlayStation 5.

Sources: Steam · YouTube