In the dawn of the 21st century, magic, long thought to be folklore and fairy tales, has become a systematized technology and is taught as a technical skill. In First High School, the institution for magicians, students are segregated into two groups based on their entrance exam scores: Blooms, those who receive high scores, are assigned to the First Course, while Weeds are reserve students assigned to the Second Course. Mahouka Koukou no Rettousei follows the siblings, Tatsuya and Miyuki Shiba, who are enrolled in First High School. Upon taking the exam, the prodigious Miyuki is placed in the First Course, while Tatsuya is relegated to the Second Course. Though his practical test scores and status as a Weed show him to be magically inept, he possesses extraordinary technical knowledge, physical combat capabilities, and unique magic techniques—making Tatsuya the irregular at a magical high school.

Extra episode of Mahouka Koukou no Rettousei: Yoku Wakaru Mahouka! included in the BD/DVD.

In the story, the seasons have changed and it will soon be the second spring. Tatsuya and Miyuki have finished their first year at First Magic High School and are on their spring break. The two go to their villa on the Ogasawara Island archipelago. After only a small moment of peace a lone young woman named Kokoa appears before them. She has abandoned the Naval base and she tells Tatsuya her one wish. (Source: ANN)

Vivio Takamachi, a Sankt Kaiser royalty of ancient Belka, was previously subjected to mistreatment. Fortunately, she now lives a peaceful life with family and friends while practicing martial arts with her coach, Nove Nakajima. However, Vivio soon becomes the target of the mysterious fighter Heidi E. S. Ingvalt, who demands Nove to reveal the location of the ancient Belkan royals. Refusing to disclose this information, Nove finds herself in a losing battle but Heidi soon falls unconscious. In addition, Nove discovers Heidi's true identity to be a middle school student named Einhald Stratos. When she regains consciousness, Einhald clarifies that she has no animosity toward ancient Belkan royals. Having inherited the passion to defend and harboring regretful memories of her ancestor, the ancient Belkan ruler Claus Ingvalt, she simply wants to prove that her fighting ability is strong enough to protect others. Intrigued by the girl's situation, Nove arranges for Einhald to meet with Vivio. Although they get off to an unconventional start, Vivio enthusiastically trains with Einhald, assisting her in finding peace of mind while developing a vivid friendship along the way.