When he was a child, troublemaker Yan was attacked by a ferocious spellbeast...until he was rescued by a group of Spellbook librarians. Inspired by the librarians' heroic efforts, Yan vows to turn over a new leaf and become a Spellbook librarian to repay their kindness. On the day of his employment exam, he meets Tohru, a mysterious young boy who has his own reasons for wanting to work at the library. Together, Yan and Tohru set off and join the ranks of the Spellbook Library, and begin the long journey to learn just what it takes to become a Spellbook librarian!