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."