After the completion of The King of Iron Fist Tournament 4, a fierce battle between father and son unfolded at Mishima Zaibatsu headquarters. Jin emerges as the victor in this battle, and continues to defeat Heihachi, his grandfather – but spares both Kazuya and Heihachi’s lives in honor of his mother who loved peace. Soon after Jin’s departure, a swarm of Jacks arrive at Honmaru, and begin to attack Heihachi and Kazuya – and in order to escape, Kazuya thrusts Heihachi into the swarm of Jacks. A great explosion destroys Honmaru, and a man watching from afar reports “Heihachi Mishima is dead.”
While many presume the death of Heihachi Mishima will end the reign of Mishima Zaibatsu, an announcement is made for the fifth King of Iron Fist Tournament, with an unknown replacement to Heihachi leading the organization. The fight begins.