He calls upon all his 31 sons , and tells them to search for whoever they believe to be the strongest martial artist of all .
Washitzu Naosata , the ruler of the powerful state , Unabara , is looking for his successor .
Washitzu Naosata calls upon all Washitzu Naosata 's 31 sons , and tells them to search for whoever they believe to be the strongest martial artist of all .
Washitzu Naosata , the ruler of the powerful state , Unabara , is looking for his successor .