The main storyline of Mahouka Koukou no Rettousei has been released across a number of different media and, given the series success, it has also inspired a number of official short and side stories which further expand the rich lore of the future world in which the series is set, as well as offering more insight into both the protagonists and a number of other popular characters.
The initial release of the anime was in the form of limited edition boxed sets, ten for season 1 and five for season 2. These boxed sets included guidebooks, CDs with character songs as well as short story booklets. These short stories are:
- Dream Game (Eight Parts)
- Summer Holiday - Anime Edition (Two Parts)
- Mission Hatsumode
- Beauty and the Beast (Two Parts)
- The Flute Girl (Two Parts)
Gekijouban Mahouka Koukou no Rettousei: Hoshi o Yobu Shoujo (The Irregular at Magic Highschool The Movie: The Girl who Summons the Stars) is a side story set during spring break of 2096. It has since been released as both a manga and light novel and during its screening three additional short stories were released as part of a promotion.
The Kana Ishida Art Works book is a completion of Mahouka Koukou no Rettousei artwork by the main illustrator of the light novel series, Kana Ishida. Included in this work is the short story Battle Royale.
A number of short stories have been released in Dengeki Bunko Magazine.
- The Dream Game -Crossover- Series
- Mikihiko's Story: Prisoner of The Dragon God
- Eimi's Story: Shotgun!
- Kanon and Shizuku's Story: I Can Do It Alone
- Kuroba Twin's Story: Mission to Draw Attention
- Melancholic Birthday
Included with the release of the audio drama of light novel 8 was a bonus short story set between volumes 8 and 9 titled Halloween Party in November.
Dengeki Bunko Super Appreciation Fair
As part of the Dengeki Bunko Super Appreciation Fair of 2020, a promotional short story called The Beautiful Onee-sama and That Detestable Guy on the back of a card. This short story details a brief encounter at a festival between several characters and was available in bookstores around Japan during the event.
As part of the release of Dengeki Bunko: Fighting Climax Ignition a promotional short story called Non-Biological Evolution was released on a limited edition plastic wallet featuring Miyuki. The story covers a brief conversation between Miyuki and Tatsuya over a news article.
A short story titled Mahouka Koukou no Rettousei SS was released in May of 2016. It contains the four short stories that occur during the Steeplechase Arc which where previously released in Dengeki Bunko Magazine as well as a new fifth story, Temptation of A Rose, which follows Chiba Erika and Saijou Leonhard who are attending the 2096 Nine Schools Competition to support their friends as part of the audience.
Two web novel spin-offs have been release so far.
The first is a side story titled The Plan to Assassinate Tatsuya Shiba has been released as a web novel and later rereleased as both a light novel series and in manga form. This spin off series follows the professional assassin Hashibami Yuki who is employed by the Yotsuba.
The series currently consists of:
- Disappearance of a Fool (Short Story)
- Plan to Assassinate Tatsuya Shiba (Volume 1)
- Plan to Assassinate Tatsuya Shiba (Volume 2)
- Plan to Assassinate Tatsuya Shiba (Volume 3)
- Mahouka Koukou no Rettousei (Manga) Plan to Assassinate Tatsuya Shiba
The second is a prequel for the planned side story titled Cygnus Maidens. The protagonist of this series is Juumonji Alisa, the half-sister of Juumonji Katsuto who was born though an affair their father had with a Russian defector before his remarriage to his second wife. This series is set at First High, two years after Shiba Tatsuya has graduated and follows Alisa and her friend Tookami Marika's life at magic high.
The series currently consists of: