Theodore Miller is a student at the prestigious Bergen Academy, possessing a high level of intelligence and a deep love for magic. However, he suffers from a fatal flaw for a magician: a near-zero mana sensitivity. Despite five years of tireless effort, he remains stuck at the 2nd Circle, facing expulsion and the end of his dreams.
His fate changes when he encounters a tattered grimoire in the academy library. This book is the manifestation of "Gluttony," one of the Seven Sins. Unlike normal grimoires, Gluttony physically resides in Theo's hand and possesses the ability to devour magical books and artifacts. By "eating" these items, Theo instantly gains the knowledge, experience, and mana of the original authors. With an insatiable parasite as his partner, Theo begins his ascent through the magic circles, transforming from a talentless student into a master who will influence the fate of empires and challenge the legends of the Age of Mythology.