During Ensei's term as governor of Sa province, Yūshun serves as his assistant. When Ensei resigns the position and leaves, Yūshun remains there as the temporary governor, performing his duties while voluntarily being imprisoned in a tower to protect him from the Sa clan. Yūshun loses his official status and is left in a dangerous position when Shūrei and Eigetsu are appointed as co-governors of Sa province, but Ensei assures them that Yūshun will be entirely safe, even from Sakujun Sa.