In the year 2234, after world war 5 had finally ended, planet earth was left for more than 75% uninhabitable by humans.
What was left of the human population lived in poor conditions. Mayhem spread fast, causing outbreaks of rebellion to spread across the globe. Politicians were left scrambling to find something to keep the common people entertained with.

That thing became the International Boy Fights Association, or IBFA in short. An international fighting competition with preliminaries held all over Earth's remaining capital cities.
With the winner of the Quadrennial competition, gaining riches and international fame. Or at least until the next winner was announced.

[From the official website]