When his family learned that he is harboring Shishio and decide to murder the child and pin the blame on the fugitive, Sōjirō uses the wakizashi Shishio gave him to slaughter his family. Soon after, once Shishio's wounds are healed, Sōjirō travels with him as his right hand and member of the Jupongatana.
His family found out he was hiding Shishio, so they intended to kill the child and blame him. Sōjirō used the wakizashi Shishio gave him to slaughter his family. Soon after, once Shishio's wounds were healed, Sōjirō traveled with him as his right hand and member of the Jupongatana.