Sir-Ojii-Chan

Siroji Chan III, a man who never lost a single battle and is shunned among men and held the title "The King of The Battlefield". After retiring at a young age. Many came to challenge/kill him in order to obtain the title of the strongest in the world, but all of them failed. After 70 years, a young man Named Mattio Shuzzai came to him and asked to fight him in order to inherit his title. Will the Old Legendary Man find his heir in this young man?