Jin's first appearance was within Tekken 3, where he is introduced as a boy "claiming to be Heihachi's grandson". According to official canon, during the King of Iron Fist Tournament 2, Jun Kazama and Kazuya Mishima were intimate, and Jun found herself pregnant 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" cinema 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, incapacitated, and chained up at Heihachi's private building in Hon-Maru. Later, Heihachi brings Kazuya to Hon-Maru, and, while Jin is chained, Kazuya attempts to awaken the Devil within Jin. As Jin begins transforming, he attacks and defeats his father. Next, Heihachi attempts to kill Jin and take his power for his own. 
Again, 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 (the rival company to Heihachi's Mishima Zaibatsu) sends an army of Jack robots to kill Heihachi and Kazuya. The two cooperate briefly, but Kazuya betrays...
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