The Irregular at Magic High: Invasion Arc

Mahouka Koukou no Rettousei: Escape-hen (魔法科高校の劣等生 エスケープ編) is the manga adaption of the 'Escape Arc' from the 24th to the 25th light novels.

The story of the spinoff novel follows the Kuroba twins, who are sworn to protect Tatsuya Shiba. They face a new threat when an enemy from a foreign mafia sets eyes on Tatsuya. (Source: Anime News Network, edited)

The arc follows volume 27 of the light novel.

The year is 2095. Magic has been tamed as another form of technology, and the practice of magic is now a rigorous discipline. Brother and sister Tatsuya and Miyuki Shiba are just about to start their first year at the renowned First Magic High School of Japan. But the school's ironclad rules mean that the brilliant Miyuki enters the prestigious Course 1, while her older brother, Tatsuya, is relegated to Course 2--and that's just the beginning of their troubles! (Source: Yen Press)