Stretching his Devil wings, Jin takes flight, leaving the unconscious Kazuya and Heihachi in Hon-Maru. Heihachi regains consciousness and goes to confront the exhausted Jin, but he is still defeated and is about to be killed if not for Jin's reminiscence of his mother, Jun Kazama, which causes him to spare Heihachi in honor of his mother. The father and son battle with Jin emerging as the winner. There, Kazuya's body is suddenly taken over by Devil, who knocks out Heihachi and then subconsciously taunts Jin, which causes him to wake up with his Devil powers activated. Kazuya fights Heihachi and wins, After the fight, Heihachi leads Kazuya to Hon-Maru, a Mishima Dojo in the woods where an unconscious Jin has been chained.

Kazuya is declared the default winner of Stage Seven and meets Heihachi at the final stage. They do so and at Stage Seven, where Jin and Kazuya are scheduled to fight, Jin is ambushed and captured by the Tekken Force. In an attempt to lure Kazuya and Jin out, Heihachi announces the King of Iron Fist Tournament 4, with the ownership of the Mishima Zaibatsu being the top prize, believing both his son and grandson will come to him for their own vengeful reasons.

Unknown to Heihachi, Jin went into a self-imposed training exile in Brisbane, Australia to unlearn the Mishima karate style and master traditional karate, loathing anything to do with his bloodline. Heihachi sends his Tekken Forces to raid G Corporation and retrieve Kazuya's remains, but the mission fails when the Force is wiped out by none other than Kazuya himself, who has been revived by G Corporation. Meanwhile Heihachi learns that the body of his son, Kazuya, who also had the Devil gene and whom Heihachi killed by throwing into a volcano twenty years ago, is stored in the labs of the G Corporation.

Heihachi searches for his grandson, Jin Kazama, who does possess the Devil gene. The experiment fails, since Heihachi lacks the necessary Devil gene. Two years after the King of Iron Fist Tournament 3, Heihachi Mishima and his scientists have captured samples of Ogre's blood and tissue to splice with Heihachi's genome, in order to make him immortal.

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