hmm.. guilty gear....
"the story follows ten combatants entering "The Second Sacred Order Tournament" for reasons of their own. Set in a bleak future in which its present time has just recovered from a 100-year-war against man-made bio-organic weapons called "Gears". A Gear named Testament began a plan to resurrect Justice and wipe out the human race.
Fearing this, the Union of Nations began a fighting tournament in order to find fighters who would be able to defeat Testament and the coming revival of Justice, giving the winner the prize of being able to acquire anything they desire.
As the combatants fight through the stages of the tournament they begin to find out the true meaning of the tournament. After defeating Testament in the second to last stage of the tournament, the character aids Justice's revival by being the sacrifice. After defeating the threat of Justice, order is restored with an uneasy peace."-from wikipedia