Saibou (柴望) is introduced as the minister in chief to the Governor of Baku Province in the kingdom of Kei. When Koukan, the Governor of Baku Province, is accused of conspiring to undermine the rule of the new monarch, Youko Nakajima, Saibou aids with Koukan's escape and subsequently goes into hiding himself.
During The Twelve Kingdoms: Skies of Dawn, Saibou appears as the mysterious visitor who approaches Enho sporadically while Youko is studying as Enho's student. Saibou acts as an intermediary between Enho and Koukan, and is in contact with Kantai's forces in Wa Province.
Following Gahou's arrest, Saibou is appointed the new Governor of Wa Province.