Yoshimitsu, head of the Manji Clan, plans to use money from winning the tournament to help the starving people of the world.
At the end of the King of Iron Fist Tournament 4, Yoshimitsu broke into the Mishima Zaibatsu vaults and stole the money for his own. During this operation, Yoshimitsu notices the fallen Bryan Fury and takes him to Dr. Boskonovitch.
One month later an S.O.S. goes out from Dr. Boskonovitch's research facility. Yoshimitsu rashes to the facility and finds everything in ruins and many members of the Manji Clan slaughtered. Yoshimitsu finds the defeated Dr. Boskonovitch in the deepest section of the research laboratories and learns it was Bryan, with his newly implanted perpetual power generator, that was responsible for the carnage.
"He destroyed those who helped him... I'll never forgive hom". Yoshimitsu's fist shakes with anger.
When Yoshimitsu hears that Bryan has entered the King of Iron Fist Tournament 5, he signs up as well, seeking revenge on behalf of his dead Manji Clan members.