Miya Kazuki 
Ascendance of a Bookworm (Manga) Part 2 Volume 5 [EPUB ebook] 

Lutz gets into an argument with his parents and runs away from home, furious that they refuse to accept him becoming a merchant. Their dispute quickly reaches the Gilberta Company, and only when Myne and the High Priest arrange a discussion between the involved parties is the matter peacefully resolved. At last, Myne can return her focus to making books-or so she thinks. After taking Wilma and Rosina as attendants, she finds herself dealing with another clash of opinions.
This is a biblio-fantasy by book lovers, for book lovers!