Tekken 4 playthrough with Jin Kazamaw00tYouTube video---
Jin's first appearance was within Tekken 3, where he is introduced as a boy claiming to be Heihachi's grandson. During the King of Iron Fist Tournament 2, Jun Kazama and Kazuya Mishima crossed paths, were intimate, and Jun found herself pregnant immediately afterwards. Jun disappeared into a remote mountain location where she raised Jin and trained him in her Kazama-Style Self-Defense fighting arts. Some time after Jin's 15th birthday, Jun was attacked by Ogre and disappeared. Grieving the loss of his mother, Jin swore revenge. Jin was then taken in by his grandfather, Heihachi Mishima, who began to train him in Mishima-Based Karate.
Subsequent games follow the events of Jin's ending within Tekken 3. Jin's prologue in Tekken 4 shows that, after Heihachi's betrayal, Jin fell into a pit of self-hatred, despising everything related to the Mishimas. Locating a secluded dojo in Brisbane, Australia, he spent two years unlearning the Mishima style he had used up to that point and mastered traditional karate thanks to the help of the dojo master. Eventually, the rumors of a King of Iron Fist Tournament 4 began to surface and Jin set his sights on this new tournament.
Within Jin's Story Mode, before he can make it to the fight with Kazuya in the seventh round, he is surrounded by the Tekken Force, which he was taking care of until he was overwhelmed by the vast number of soldiers in the Tekken Force. He was then taken to Honmaru. Later, Heihachi brings Kazuya to Honmaru, and, while Jin is chained, Kazuya attempts to awaken the Devil within Jin. As Jin begins transforming, he attacks and defeats Kazuya. Next, Heihachi attempts to kill Jin and take his power for his own, and is then defeated by Jin.
Based on subsequent Tekken games, Jin's ending is made the story's central focus, with Tekken 5's introduction sequence set only seconds afterward. G Corporation sends an army of JACKs to kill Heihachi and Kazuya. The two cooperate briefly, but Kazuya betrays Heihachi. The Jacks self-detonate, destroying the Honmaru and apparently killing Heihachi. However, Honmaru was the location where Heihachi had sealed his father, Jinpachi Mishima, four decades earlier. Jinpachi is freed when Honmaru was destroyed.
Jin's Prologue states that, immediately after leaving Honmaru, Jin's own Devil Gene went berserk. Jin soon found himself awakening inside of an utterly destroyed forest, realizing that he was the cause of the destruction. After returning to Yakushima, he is plagued by recurring nightmares and realizes that it's only a matter of time before the Devil Gene completely takes over. From here, the story shifts to Devil Within, as its prologue is in direct relation to Tekken 5's main story.