Gald is a servant in the household of a count who is one day falsely accused of a crime he did not commit. He is declared to be worse than garbage and is subsequently dismissed from his position, cast out with nowhere to go. With his life seemingly in ruins, he notices a recruitment flyer for the Remillion Magic Academy in the royal capital and decides to take the entrance examination as a last resort.

The entrance exam for this academy is reputed to be exceptionally difficult, but Gald passes with ease. This extraordinary feat is explained by the revelation that in his past life, Gald was actually the strongest sage. His apparent weakness as a servant was merely a guise, concealing the immense magical power and knowledge of a legendary sage from a previous existence. The story follows his new life as he enrolls in the world's most prestigious magic academy, where he navigates a new environment filled with nobility and gifted students while hiding the secret of his former life.

The narrative centers on the contrast between Gald's lowly status as a banished servant and his true, overwhelming power as a reincarnated sage. The setting is a fantasy world with a European-inspired ambience and a strong focus on magic, nobility, and academic hierarchies. A key narrative arc begins with his false accusation and banishment from the count's household, which serves as the inciting incident. This is followed by his journey to the royal capital, his successful entrance exam, and his subsequent integration into the academy's elite social and magical environment.