TOUGH(2003)

In underground matches where hundreds of millions of yen are on the line, a man who finds meaning only through combat steps into the ring. Kiichi Miyazawa, 19 years old, the fifteenth head of the Nadashinkage-ryu. Two years after the brutal, life-and-death battle between his father Seiko and Kiryu, Kiichi continues to fight powerful opponents, driven by the hope that his broken father might one day recover. A colossal martial-arts saga begins!

(Source: MANGA MILLION)