Ieyasu

イエヤス

Ieyasu was a childhood friend of Tatsumi and Sayo who set out on a journey to the capital to earn money for their village. He appeared to have a poor sense of direction and was a known troublemaker.
During their journey, they were attacked by night bandits, which separated them. He managed to stay with Sayo and was invited by Aria to her mansion. They were served a meal that caused them to lose consciousness. He was given drugs that made him suffer from "Lubora disease." He survived until Tatsumi and Night Raid arrived at the place where he, Sayo, and other people lured by Aria and her family were imprisoned. He seemed glad when Tatsumi killed Aria. He then succumbed to the final stages of "Lubora disease."
Ieyasu was shown wielding an axe. He presumably possessed combat abilities on par with Tatsumi, as they and Sayo had trained together since they were little.