Ascendance of a Bookworm: Part 3 Vol 1

From the J-Novel Club edition

Myne is determined to protect those she cares about most, so she abandons the life she knows to become Rozemyne, the archduke's mana-rich adopted daughter. She charges forward into this strange new world, not letting her new persona change her passion for books! Watch as the setting of this biblio-fantasy by book lovers, for book lovers continues to expand... along with the book-making industry!

Source: Yen Press