The leader of the Shogun's Banshu samurai, the Bangashira. He first appears in Dark Shadows part 1.

He is also the secret leader of the Mugai-ryū. He simultaneously invites the Ittō-ryū to become an official sword school while directing the Mugai-ryū against it. Kagimura also masterminded and took part in the massacre that occurred during a feast welcoming the Ittō-ryū into the Banshu. Abayama's comments imply that he is incredibly skilled with a sword, as evidenced by his attack on Manji in Trickster, volume 15.

(Source: Wikipedia)