Main Story: Mishima Bloodline
Pre Tekken 1:Heihachi Mishima is the owner of a corporation called the Mishima Zaibatsu, which was formerly called the Tekken Zaibatsu and was run by Jinpachi Mishima, Heihachi's father and world renowned martial-artist, until Heihachi overthrew Jinpachi and claimed the Zaibatsu as his own. Heihachi also has a son called Kazuya, whom he mistreats because he believes his son is weak due to his son's kind and loving nature that came with growing up with a loving treatment from his grandfather Jinpachi. Growing tired of his son's kindness, Heihachi takes his son to a nearby cliff and declares that if Kazuya were truly his son and able enough to take the Mishima Zaibatsu, he would survive the fall and climb back up. Heihachi tosses his son off a cliff, and Kazuya survives, but only thanks to the Devil Gene in his blood. To further spite his son, Heihachi adopts a Chinese orphan named Lee Chaolan and raises him only to be a rival to Kazuya, nothing more. As Kazuya grew older, he participated in many martial arts championships, gained an undefeated streak, only to have his record blemished in a draw against Paul Phoenix. Recognizing the growth in strength in Kazuya, Heihachi announced the very first King of Iron Fist Tournament.
Tekken:After the announcement of the tournament, many people have entered, each with their own goal in mind and the strive to win, Kazuya being one of them. After cutting through many of the participants, Paul Phoenix and Lee Chaolan being one of them, Kazuya makes it to the final round, with his father as the final opponent. After defeating Heihachi, Kazuya tosses Heihachi off the same cliff the former was tossed in as a child. The tournament concludes as Kazuya is now the new King of Iron Fist and the new head of the Mishima Zaibatsu and it seems as though all is well, right?
Tekken 2:After Heihachi's defeat, Kazuya is now the new head of the Mishima Zaibatsu. With absolute power in his hand, Kazuya goes on to inflict even more unspeakable horrors, marking his deeds even worse as when Heihachi ran the corporation. During Kazuya's reign of terror, it is revealed that Heihachi has survived the fall from the previous tournament and has been training for the day he finally defeats Kazuya and reclaims what he had lost. Hearing that his father has returned, Kazuya announces the second King of Iron Fist tournament to wipe the floor with anyone foolish enough to stand in his way. During the tournament, Kazuya encounters a woman called Jun Kazama, and unwittingly falls for her and impregnates her with his unborn son, Jin. After some time, Heihachi eventually makes it to the final round and battles Kazuya once more. Kazuya is defeated due to his internal struggle between his evil side Devil, and his good side Angel, which appeared after meeting Jun. Kazuya then transforms into his Devil form and does battle with Heihachi for one last time. Kazuya is defeated by Heihachi and to make sure he stays dead, Heihachi tosses Kazuya into an erupting volcano.
Tekken 3:Fifteen years after the conclusion of the 2nd King of Iron Fist Tournament, Jun Kazama is found living with her son, Jin Kazama. Sensing that something is wrong, Jun tells Jin that should anything ever happen to her, Jin should go to his dear old grandfather, Heihachi Mishima. Speaking of Heihachi, he has organized his own team, the Tekken Force, an organization which has helped protect the Mishima Zaibatsu and has led to world peace. However, Heihachi has heard rumors of a being called Ogre after a squadron of Tekken Force soldiers has been wiped out by said being. With Ogre on his mind, he formulates a plan to capture Ogre and of course, take over the world. On Jin's 15th birthday, Ogre arrives and Jun tells Jin to run away, but against his mother's pleas, battles Ogre, only to be swatted away and knocked unconscious. Soon after, Jin wakes up to find his home completely wrecked and his mother nowhere in sight. Following his mother's wishes, Jin finds Heihachi, tells him everything that has happened and asks to be trained by him so that he can avenge his mother, and is taken in by his dear old grandfather. At the age of 19, Jin has became an impressive martial arts fighter thanks to his grandfather's training. Heihachi then announces the Third King of Iron Fist tournament so he can lure out Ogre while Jin enters to take down Ogre once and for all, all the while unaware of his grandfather's secret motives. Jin cuts through many opponents, one of them being his rival Hwoarang, whom Jin had defeated during Heihachi's tutelage and is now itching for a grudge match. Jin arrives at Ogre's temple and before Jin can face Ogre, he faces off against his grandfather. Heihachi battles Jin so that he can test his skills and during the battle, Heihachi noticed that Jin was starting to show dangerous amounts of power, the same amounts Jin's father Kazuya had. Jin defeats Heihachi and advances onwards still unaware of what lies ahead. After Paul Phoenix, a contender of the previous two tournaments, defeats Ogre, he pridefully leaves the tournament, unknowing that the tournament still continued after his sudden departure and Ogre had transformed into a much more beastly form. Jin arrives and takes down True Ogre with all the fury he could muster. After True Ogre's defeat, Jin is then gunned down by the Tekken Force led by Heihachi and since Ogre is gone, Heihachi no longer needs Jin for his own ends and blasts Jin in the head. Not long after, one of Heihachi's men is thrown across the room, Heihachi bearing witness to the birth of Devil Jin, due to the Devil gene Jin inherited from his father Kazuya. Jin strikes down Heihachi one last time and flies off into the night, Heihachi in shock and awe of the recent events.
Tekken 4:20 years ago, Kazuya Mishima was thrown into the mouth of a volcano by his father Heihachi. Many had assumed he was dead. But he wasn't. G Corporation, a rival company to the Mishima Zaibatsu, had discovered Kazuya's burned corpse only a few days after the incident. Through the use of cutting edge biotechnology, he was resurrected. Out of gratitude, Kazuya allies himself with G Corporation, voluntarily subjecting himself to experiments in order to study the Devil Gene. He remained the company's greatest secret for 20 years until one day, when the lab was suddenly attacked by members of Heihachi's Tekken Force, in the hopes of stealing their secrets. Kazuya is discovered by members of the Tekken Force, but he effortlessly slaughters them all with his newfound control over the Devil. Meanwhile, Jin Kazama has been training in a karate dojo in Australia. Ever since the day Heihachi betrayed him, Jin has hated everything involving the Mishima bloodline, and has resolved to end his curse by killing Heihachi. He has unlearned the Mishima-ryu style, and learned traditional karate instead. It is around this time that new invitations for the King of Iron Fist Tournament are sent out. Kazuya and Jin proceed through their opponents, until the two are the only remaining finalists. Before their match, however, Jin is captured and taken to the Mishima Zaibatsu's Hon-maru compound. Winning be default, Kazuya confronts Heihachi but loses to him. Heihachi does not kill him, but instead takes Kazuya to Hon-maru to meet his son. Kazuya and Heihachi arrive at Hon-maru, where Jin is chained with bonds that have been specially designed to nullify his Devil powers. Kazuya immediately turns into Devil upon seeing Jin, explaining that a fragment of itself split off from Kazuya moments before he was burned to death by the volcano, and implanted itself within Jin. After effortlessly knocking Heihachi away, Devil moves towards Jin to take its power back, but Kazuya regains control, and states that he has now merged himself with Devil completely by unifying their powers. Kazuya now has full control of the Devil, and can unleash it at will. Kazuya proceeds to fight Jin, but Jin gets the upper hand and defeats his father. Heihachi returns to take Jin's power for himself, but Jin effortlessly defeats him too. Poised to finally kill his father and grandfather, Jin transforms into Devil Jin and readies himself to get rid of Heihachi first, but he sees a vision of his mother Jun, and drops Heihachi. "Thank my mother, Jun Kazama." With those words, Jin flies off into the night, leaving Kazuya and Heihachi unconscious within the Hon-maru temple.
Tekken 5Shortly after Jin's departure, an army of Jack robots surround the Hon-Maru temple to eliminate both remaining Mishimas. Kazuya and Heihachi fought together back-to-back for survival, but eventually, Kazuya betrayed Heihachi and tossed him to be dogpiled by Jack robots that executed a sequence of mass self destruct while Kazuya fled by transforming into the Devil. The Hon-maru explosion was witnessed by the ninja Raven and declared that "Heihachi Mishima is dead." Although unknown to Raven, Heihachi was instead thrown far away and survived, but he was unconscious for a very long time. Meanwhile, with Heihachi's absence, the Mishima Zaibatsu was in a vacuum of power, but all of the sudden, someone took over. The explosion of Hon-maru released the imprisoned Jinpachi Mishima, but in his time of imprisonment, he became possessed with a dark power similar with the Devil. With what remains of his good heart, he used his reclamation of his old Zaibatsu to announce the fifth King of Iron Fist Tournament, and hoped that someone strong will be able to put him out of misery. Amongst the participants were Kazuya and Jin. Kazuya entered in order to find out if the Zaibatsu was the ones sending the Jacks to kill him. But to his surprise, it wasn't the Zaibatsu, but the very same group that resurrected him: the G Corporation. Noticing this, Kazuya lost interest and dropped out of the tournament to exact his vengeance over this treachery, letting Jin advance to the finals. His intention was to eliminate the cursed bloodline of Mishima and he defeated Jinpachi. On his victory, Jin received his prize, the ownership of Mishima Zaibatsu. From that point on, something seemed to change as Jin began to look a lot more sinister than usual...
Tekken 6Upon claiming ownership of the Zaibatsu, Jin began to act a lot more ruthless than usual, repeating the same practices of his father and grandfather and took it even further to initiate a third world war, making people see him as a tyrant. In the same time, Kazuya, after slaughtering everyone in the section of G Corporation that orchestrated his betrayal, managed to take over the Corporation and amassed a lot of influence, enough to match the Zaibatsu's influence. The people saw this as a sign of a savior for the tyrannical Zaibatsu and gave support to Kazuya. To retaliate on this, Jin announced the sixth King of Iron Fist Tournament to eliminate all oppositions. And even the Tekken Force began to question Jin's methods and decided to rebel secretly. They are led by a charismatic man named Lars Alexandersson, bastard son of Heihachi. During one of his raids, he stumbled upon Alisa Boskonovitch, a robot based on the daughter of Dr. Geppeto Boskonovitch, and took her as his friend. They grew close as they uncover about the whole war between the Zaibatsu and the G Corporation... until Lars finally confronted Jin atop of his throne... What was formerly a battle Lars could win was turned upside down when Jin reveals that Alisa is programmed to spy on his movement and had her turn against him. Fortunately, Lars was saved by Raven, who took him to a desert area, a ruins of an ancient God. Jin and Kazuya headed there, and in there, Lars witnessed the appearance of the progenitor of the Devil Gene, Azazel. Lars seemingly defeated him, but while exiting, he was ambushed by Jin and Alisa. After being forced to defeat and dismantle Alisa, Lars managed to defeat Jin, and made him admit that every one of his atrocities was a gambit to ensure Azazel took form so he could be destroyed once and for all and rid the world from the cursed Devil Gene. True to his words, Azazel returned to form, this time as a gold-colored, more powerful version of himself. Jin tackled the beast to oblivion, hoping to perish together with him. With Jin gone, the Zaibatsu would require another reformation, something that would be taken care of by Jin's bodyguard, Nina Williams. Alisa was successfully repaired by Lee Chaolan (who lent his aid to Lars beforehand) and Lars seemed to return to his duties as a Tekken Force soldier. However, much to Raven's surprise, it seemed that Jin survived... again. Unbeknownst to anyone, the primary cause of the Mishima bloodline's horrible feud still lingered. Kazumi Mishima...is alive. To Be Concluded in Tekken 7
There is also an on-going sub story revolving the masked luchadores under the name 'King'. While they are not involved with the Mishimas, they also form up a bit of a continuity.