
The Irregular at Magic High School: Master Clans Summit
Mahouka Koukou no Rettousei: Shizoku Kaigi-hen
By Satou, Tsutomu, Takeda, Hazumi
The arc follows volumes 17-18 of the original novel series.
The Irregular at Magic High School is based on the manga "Mahouka Koukou no Rettousei: Shizoku Kaigi-hen" — 53 chapters, 9 volumes. The manga is complete. By Satou, Tsutomu.
Anime covers: Chapters 1–198 (both seasons, through Magnostadt arc)
Start reading at: Chapter 199 (Volume 20)
Faithful adaptation? Yes — Mostly faithful in plot but compresses and rearranges parts of later arcs, especially Magnostadt's back half

Mahouka Koukou no Rettousei: Shizoku Kaigi-hen
By Satou, Tsutomu, Takeda, Hazumi
The arc follows volumes 17-18 of the original novel series.

Mahouka Koukou no Rettousei: Shiba Tatsuya Ansatsu Keikaku
By Satou, Tsutomu, Ichino, Yuyu
The manga features a new heroine named Yuki Hashibami, a magician assassin who is not a magician herself. She challenges Tatsuya in the story. (Source: ANN)

Mahouka Koukou no Rettousei
By Satou, Tsutomu, Ishida, Kana
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...

Mahouka Koukou no Rettousei SS
By Satou, Tsutomu, Ishida, Kana

Mahouka Koukou no Rettousei: Shiba Tatsuya Ansatsu Keikaku
By Satou, Tsutomu, Ishida, Kana
The novels feature a new heroine named Yuki Hashibami, a magician assassin who is not a magician herself. She challenges Tatsuya in the story. (Source: ANN)
Not necessary for continuation. Optional — you can jump in at 199, but starting from chapter 1 lets you see all the political and character nuance that gets trimmed. The anime was a faithful adaptation, so you won't miss anything critical by jumping ahead.
Yes — the manga "Mahouka Koukou no Rettousei: Shizoku Kaigi-hen" runs 53 chapters and is complete. There are 5 related works total.
The anime covers Chapters 1–198 (both seasons, through Magnostadt arc). To continue the story, start reading at Chapter 199 (Volume 20).
You can safely skip ahead. Optional — you can jump in at 199, but starting from chapter 1 lets you see all the political and character nuance that gets trimmed. Starting from chapter 1 is always an option if you want the full manga experience though.
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