Kazumi Mishima is the late wife of Heihachi Mishima, the late daughter-in-law of Jinpachi Mishima, the late mother of Kazuya Mishima and the late grandmother of Jin Kazama.

After being thrown off a cliff as a child, Kazuya Mishima enters the King of Iron Fist Tournament to extract revenge from his father, multi-billionaire Heihachi Mishima. Meanwhile, WWWC operative Jun Kazama and Hong Kong detective Lei Wulong also enter the tournament to investigate on Heihachi's illegal activities involving cloning and genetic engineering. A handful of other skilled fighters are also in it merely to win the grand prize of $1 billion, not knowing of the true purpose of the tournament and fate that awaits them.
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(Source: Anime News Network)