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Makoto Shishio's right hand man and a skilled teenage assassin. He is the strongest of Shishio's men having been trained by the former battousai himself.
An illegitimate child, Soujiro was raised in a hateful family after the death of his father. Soujirou was raised as the proverbial punching bag of his family members who believed he was only out for their money despite his young age. He discovered the burned Makoto Shishio as he killed two police officers. Shishio almost killed the boy but was shocked that he merely smiled about his impending fate, rather than screaming, which he expected. Soujiro provided Shishio with food and bandages and in return, Shishio taught him his "survival of the fittest" philosophy and gave the boy a waikisashi. When his family discovered the missing bandages and food they determined that Soujiro was harboring the fugitive battousai. They decided to kill him to prevent him from causing them more trouble. Soujiro killed the entire family and left with Shishio, who made him a highly skilled killing machine with a smile. He was 8 at the time.
He assassinated Okubo, setting off the chain of events in the Kyoto Saga.
His high speed footwork, powered by his powerful legs is called the Shukuchi, which means reduced earth. He is so fast that when he performs the technique, it appears that the distance between him and an opponent has shrunk. He hides his emotions behind his smile and humble, polite demeanor.