He is called "Sosuke the Exterminator" for his constant hunts for thugs and anyone who preys on the weak and innocent. He had run away from home to Fukuoka in order to find a way to surpass his grandfather
Kiryu first meets him in Nagasugai, Fukuoka. Sosuke wants to defeat Kiryu in order to surpass his grandfather but loses. Afterwards, he decides to re-train Kiryu with Komaki techniques and teaches Kiryu about the Red Heat mode. After finishing the last training, he tells Kiryu that he wants to go to Kamurocho.
Sosuke as he describes himself is someone who is well built but thin, bearing the typical looks of hosts. He wears a hooded jacket with white sleeves and plaid vest.
Sosuke is considerably much more hot headed than his grandfather. As a youth, he suffered from low self esteem as his peers would rarely give him praise. As such he felt that the only way to prove his worth is to master the techniques from Sotaro and beat him with his newfound techniques. Sosuke eventually realize that his pursuit to exceed his grandfather that he was losing sight of what his grandfather was teaching him.
Fighting style Edit
Like his grandfather he is a practitioner of the Komaki Arts and thus knows all of the Komaki moves. Compared to his grandfather, he often enters a bout of rage which makes him impervious to all attacks.