His ancestors came from Omi Province (Shiga Prefecture). Served Lord aganori Asano is Umamawari (mounted horseman acting as guard for his master). His two sons, Mitsuoki (Jujiro) and Mitsukaze (Shinroku), also participated in the famous vendetta on Yoshinaka Kira which was led by Yoshio Oishi. Mitsunobu disguised himself as a physician to spy on his lord’s enemy b.