The fighting competition held in the Cologne Philharmonic Hall in Germany, known as "cage fighting", is in full swing. This event is famous for its bloody violence. The competitors fight in an octagonal iron cage and are allowed to use various kung fu such as freestyle wrestling, jujitsu, taekwondo, boxing, etc.. "Cage fighting" was once called "black boxing" by outsiders, and the scene was very bloody and violent. However, after continuous modification of the rules in recent years, it has become a sports event.