A young teacher named Aoi Konominato dies on Earth and reincarnates as a child in a fantasy world, filled with regret over her unfulfilled goals and lackluster previous life. An eccentric elven sage named Owain takes her in and trains her in sorcery for twelve years, during which she masters everything he teaches. When her training is complete, Owain sends her not to continue as a student, but to become an instructor at Fiddich Academy, the most prestigious magic school in the world.

The setting is a standard fantasy realm where noble birth determines social status, and the academy is filled with arrogant students from royal and aristocratic families who are accustomed to doing whatever they please while teachers look the other way. Aoi, now a young woman with an exceptionally stoic and deadpan personality that others find terrifying, takes a radically different approach. She is absolutely dedicated to advancing the study of sorcery and refuses to tolerate any behavior that impedes the learning of others, regardless of a student’s social standing.

The core conflict emerges as Aoi challenges the entrenched hierarchy of the school and the wider world. Her methods are blunt and her magical power is overwhelming, causing people to consistently underestimate her due to her small stature before she effortlessly defeats them, physically or intellectually, and converts them into reluctant supporters. Her ultimate goal is to reform the entire system of magical education, though her cold demeanor and absolute confidence make her appear like a fearsome witch to nearly everyone she meets.

Several notable narrative arcs unfold across the series. In an early arc, Aoi directly confronts the misbehavior of Prince Rox of Vahtedd by not only defeating him but summoning the king and queen for a parent-teacher conference, forcing the royal family to answer for their son’s actions. When class attendance plummets, she investigates and discovers students have been lured into a gambling den run by a crime syndicate, leading her to single-handedly take down the city’s entire criminal underworld and force the surviving organizations to become legitimate businesses. Later, Aoi travels to the Holy Maple Leaf Empire as part of an exchange to study their healing magic, only to find a society that believes magic has reached its final form and resists all new research. She proceeds to demonstrate that her magic far surpasses their own, causing a diplomatic incident while setting the stage for a revolution in sorcery worldwide. Subsequent volumes involve helping students prove their worth to their families, managing the academy’s cultural festival, and dealing with the political consequences of forcibly dragging the fantasy world into a new era of magical advancement whether its inhabitants are ready for it or not.