 He arranges the murder of his older brother, Sōjun, in order to manoeuvre himself to become the strongest candidate for leadership of the Sa Clan and thus the natural choice for a strategic marriage to Shūrei.To his surprise, he finds himself falling in love with Shūrei, who refuses to return his affections.Sakujun eventually allows Shūrei to poison him without her knowledge to test whether she loves him or not.