Kazuma Kiryu is a man who lives with a great sense of duty and humanity who has never lost a fight. In order to protect his childhood friends who he grew up with in an orphanage, he throws himself into the underworld.

Kazuma Kiryu is a man who lives with a great sense of duty and humanity who has never lost a fight. In order to protect his childhood friends who he grew up with in an orphanage, he throws himself into the underworld.