"Mahōka Kōkō no Rettōsei: Nyūgaku-hen" is a manga adaptation of the light novel series "Mahōka Kōkō no Rettōsei" by Tsutomu Satō, with art by Yuu Mori. The story is set in a world where magic has been systematized through modern technology, and individuals who wield it are highly valued. The narrative centers on Tatsuya Shiba, a seemingly unremarkable student at First High School, a prestigious institution for magicians. Despite his low scores in practical magic, Tatsuya possesses exceptional technical knowledge and combat skills, making him a formidable figure.

Tatsuya enrolls in First High alongside his sister, Miyuki Shiba, who is a prodigy with extraordinary magical abilities. The siblings share a close bond, with Miyuki deeply devoted to Tatsuya. The story explores their experiences as they navigate the school’s hierarchical structure, which divides students into two groups: the elite "Blooms" (Course 1 students) and the less-regarded "Weeds" (Course 2 students). Tatsuya, despite being a Course 2 student, quickly garners attention due to his unique abilities and calm demeanor.

The plot unfolds through a series of events that highlight the societal and political tensions surrounding magic. Tatsuya’s true capabilities are gradually revealed, showcasing his strategic mind and combat prowess. He becomes involved in various conflicts, including confrontations with rival students, espionage, and threats from external organizations. These events often test his loyalty to his sister and his resolve to protect those close to him.

Key characters include Miyuki, whose magical talent and poise make her a central figure in the school; Erika Chiba, a skilled swordswoman and Tatsuya’s classmate; and Mayumi Saegusa, the student council president who takes an interest in Tatsuya’s abilities. The series also introduces antagonists such as Masaki Ichijou, a rival from another school, and various shadowy figures who seek to exploit or eliminate Tatsuya.

The manga delves into themes of power, discrimination, and the ethical implications of magic in a technologically advanced society. It balances action-packed sequences with moments of character development, particularly focusing on Tatsuya’s enigmatic personality and his relationship with Miyuki. The narrative maintains a steady pace, blending school life with larger, high-stakes conflicts, creating a compelling exploration of magic and its impact on the world.