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|Full Name||Juumonji Kazuki|
|Affiliation||Ten Master Clans (Juumonji)|
|Occupation||Former Clan Head|
|Novel||Volume 17, Chapter 5|
Juumonji Kazuki (十文字 和樹) is the former head of the Juumonji family, which is one of the Ten Master Clans. In AD 2097, during the Ten Master Clans Conference, he stepped down as head of the Juumonji Clan and announced his son, Katsuto, as the next head.
He is the owner of a Civil Engineering Construction Company, which specializes in supporting the National Defense of Japan.
Going back three years, while at the Juumonji's House, Kazuki started to suffer from a specific illness that started reducing his magic capacity. This was due, in part, to the Juumonji family's ability to over-clock their brain's Magic Calculation Area. Then, going back two years, he was no longer able to use magic in combat. Finally, three months before the Master Clans Conference, he lost the ability to use magic entirely.
During the Conference, Kazuki stepped down as head of the Juumonji family. His son, Katsuto was announced to become the next head, and the decision was unanimously agreed upon by the other heads.