Rungo is a strong yet kind-hearted miner who had discovered a hidden uranium deposit belonging to the Secret Society prior to the first game. When the Secret Society learned of this, they kidnapped his wife Lila and son Christopher[2]. After being led to the first Toshinden tournament, he entered it to rescue them and was successful in his mission[3]. One year later, Rungo had received a call for help from Gaia. From within an explanation, Gaia had told Rungo that he had hosted the tournament illegally and was now being branded a traitor and marked for death by Uranus, one of his co-workers in the Secret Society[3]. Although Rungo had fought against him in the last tournament while trying to save his family, he realized Gaia was not the one responsible for their kidnapping. Rungo agreed to help Gaia get revenge and entered the second tournament[3]. He was successful in destroying the Secret Society with the rest of the fighters and eventually Uranus was killed. When a third tournament was announced, Rungo learned that it was being hosted by the Organization and that he was one of their targets. He entered the tournament to help destroy the Organization. With the fall of the Organization, it is assumed that Rungo had retired from the fighting scene so that he can be with his family and continue his life as a decent miner.

For one year, Master Swordsman Eiji Shinjo has been haunted by the memory of his battle with the renegade champion, Gaia - a battle that was cut short by the forces of the malevolent syndicate known as "the organization." 
Denied victory, Eiji left the tournament followed by his opponents mocking laughter. Worse still, Eiji walked away no closer to finding his long lost brother, Sho. But now, a mysterious warrior is hunting down the champions of the previous tournament and using their own moves against them - and it looks like that person may be Sho. Who is this powerful new foe and who is his next target? 
Eiji and Kayin, his closest friend and greatest rival, struggle to unravel the mystery before they, too, join the ranks of the defeated. The answer lies at the heart of the Organization and its plans for world domination. At last, the ultimate battle between the greatest fighters in the world will be decided. But if Eiji loses, his friends - Ellis - may Die... 
(Source: AniDB)

[Wiki (jp)](https://ja.wikipedia.org/wiki/辻親八)

Rungo Iron