Jinpachi was finally freed from his prison when the Jack-4s destroyed Hon-Maru. Jinpachi was imprisoned beneath Hon-Maru 44 years ago by Heihachi and has been possessed by a malevolent entity. Jin enters the tournament and makes it to the final round, where he is confronted with the monstrous form of his great grandfather, Jinpachi Mishima. With Heihachi Mishima believed dead, it is unclear to the competitors who has called the competition. The King of Iron Fist Tournament 5 is announced by the Mishima Zaibatsu. Realizing he cannot go on like this, he sets out to try and destroy the evil at its root. Jin retreats to Yakushima, but is plagued by nightmares that trigger his Devil Gene.

He realizes that his devil form caused the destruction. He blacks out shortly after fleeing Hon-Maru and wakes up in a destroyed forest. Meanwhile, Jin Kazama's Devil Gene causes him to lose control. Speaking into an earpiece, he reports, 'Heihachi Mishima is dead.' A mysterious character, Raven, watches the scene from a nearby cliff.

While Heihachi is restrained, the robots self-destruct, destroying Hon-Maru. During the battle, Kazuya escapes after betraying Heihachi and throwing him into the path of the robots. Kazuya and Heihachi begin fighting as a team against the robots.

Shortly afterwards, just as Heihachi and Kazuya are coming to, numerous Jack-4 robots deployed by G Corporation crash through Hon-Maru's walls and attack. Jin ultimately defeated his grandfather and father and fled the temple in his devil form.

The King of Iron Fist Tournament 4 concluded with a face-off between three generations of the Mishima family – Heihachi Mishima, Kazuya Mishima, and Jin Kazama – in Hon-Maru.

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