sojun sa

Eldest grandson of Chūshō Sa. He has two brothers, Sakujun and Kokujun. Sōjun is also familiar with Seiran and Ensei, and wishes to become the most powerful of the Sa Clan. As such, he takes part in kidnapping the two newly appointed Sa Province governors, Eigetsu To and Kōrin, who he believes to be Shūrei.

Believing that the Satsujinzoku is under the control of his grandfather, he tries to persuade Meishō, leader of the group, to work with him instead in an attempt to gain more power. Sakujun later kills Sōjun, though he believes, to the last, that it is Kokujun who arranges it.