After the conclusion of King of Iron Fist Tournament 4, father Kazuya Mishima and son Jin Kazama, battle each other at Honmaru, located within the Mishima estate. Jin quickly beats his father. The eldest Mishima, Heihachi, enters the Honmaru to find his son defeated and unconscious. Heihachi and Jin begin battling. During the battle, Jin begins to manifest the Devil he inherited from his father, Kazuya. Just as it appears that Jin will kill Heihachi, Jin suddenly gains control of his body and flies away.

Suddenly, a bunch of "Jack" robots interrupt the battle. Both Kazuya and Heihachi are surprised at the attack, and begin battling as a team against the invasion. During the battle, however, Kazuya betrays his father, throws him into the kiss of death. Raven, watching on top of the cliff, speaks into a headphone, reports, "Heihachi Mishima...is dead."

After hearing of Heihachi's death, people believed that it would bring the end of the Mishima Zaibatsu. However, an unknown person had taken control, and a month later Mishima Zaibatsu announced the opening of The King of Iron Fist Tournament 5.