Under the vibrant city is a ring of blood, sweat and tears. An illegal company instituted an entire underground system of connections and various rings for people to fight for prizes and money. Many people, even civilians, go there to watch what sort of unreal battles and deadly blows are exchanged. The only rules are not to kill your opponent, and there are countermeasures to ensure both parties to be safe afterwards. But for now, feel the heat in your blows and fight your way to the top!