Arashi Shinju is, quite possibly, the greatest fighter in Japan. He is gifted in seemingly all aspects of combat, and wields martial arts honed throughout generations of his family. He is also a man seemingly devoid of any compassion or true kindness, even towards his own family. This is not merely his reputation - rather, it's that of his entire bloodline.
His son, Kotaro Shinju, is the greatest victim of this. Trained to succeed him, he is continuously battered and beaten by his training, and even his mother is afraid of the father. This all built up into a resentment for his father, and the entire Shinju bloodline, and so, his goal became clear.
"I'll show you all... I'm nothing like my predecessors!"