At the intersection of light and darkness in modern cities, there are two parallel fighting worlds. Above the ground is the glamorous "Glory Fighting League", with live TV broadcasts, commercial sponsorships, and star boxers forming a glamorous appearance; underground is the illegal boxing ring known as "Black Boxing Purgatory", where there are no rules, only life and death, and it is a bloody playground controlled by capital. The two worlds seem to be isolated, but in fact they are shrouded in the same shadow - the "Boxing Alliance" organization that controls the fighting industry chain. They make huge profits by manipulating matches and selling gambling, even at the expense of the lives of boxers.
