First Appearance - Episode Two Dark music of the Gods
After the death of his father, Sosuke and his mother were forced to leave their home. They journeyed through the bitter cold to Awa. On their journey his mother dies, but Sosuke is "saved" by Hikiroku of Otsuka village. In return for saving his life, Hikiroku makes Sosuke his man-servant for life and changes his name to Gakuzo.
When Shino begins his journey to Koga, Sosuke is ordered by Kamezasa, Shino's aunt, to kill him and bring back the Murasame. In return, he would be able to leave the house of Otsuka and restore his family name. In their confrontation, Sosuke and Shino learn that fate has brought them together and they both make a pledge of brotherhood.
Sosuke Inukawa is the dog warrior of Duty. His character bead is "Gi" meaning duty.