Sōju Asano

is the lord of Asano Castle and the father of Sara Asano. He was engaged in a war with another unmentioned lord. The war reached its peak when the enemy set siege against Asano Castle, but the tide was turned in Sōju's favor when Sesshōmaru unexpectedly appears and destroys the enemy army, saving Asano Castle and its inhabitants.

The war ended, but shortly after Sōju discovered that his daughter had fallen in love with Sesshōmaru. Horrified by the revelation he gathered his army and attacked the injured dog demon who effortlessly massacred his forces. Sōju fled back to Asano Castle where he committed suicide for fear of Sesshōmaru's retaliation. Soju Asano 阿佐野双树