following the end of the king of iron fist tournament 4, heihachi mishima defeated kazuya mishima and led him to honmaru temple, planning to let both his son kazuya and his grandson, jin kazama, battle and steal their "devil genes". jin defeats both his father and his grandfather and flies away, leaving the latter two asleep. shortly after, a group jack-4 robots invade the honmaru. the robots were made to take heihachi's life. at the start, kazuya and heihachi fight the jack-4's as a team, but eventually kazuya throws heihachi across the room as soon as he notices that heihachi is getting tired. then, kazuya turns into devil kazuya and escapes, leaving heihachi to deal with the jack-4's by himself. they quickly explode, leaving heihach. the explosion brings heihachi's father jinpachi mishima back to life from his 50 year sleep beneath the temple, and goes to and become head of the mishima zaibatsu. a few months later, the king of iron fist tournament 5 is announced. it turns out that heihachi survived the explosion, and now promises to find out and "break the neck of the one who started this ridiculous tournament!"