Fukuzawa Yakumo XII is the current head of the Yakumo Clan, one of the eight ancient houses that once served the Shogunate of Japan, and a living figure whose age exceeds eleven centuries. He stands as the twelfth bearer of the Yakumo name, surpassing even the legendary Akamura Yakumo in accumulated wisdom and authority. He remains active despite his age, commanding influence over both his clan and external factions, including criminal syndicates and political elites.