The massive criminal organization 'Angel'.

Deep beneath their back-alley headquarters lies a tangled web of entertainment. From brothels and bars to arenas, gambling dens, secret trading posts, and lodging.

Among these, the arena is the most popular attraction.

In the arena, players must do whatever it takes to take down their opponent in a 1-on-1 format.

Weapons are strictly forbidden, but anything else goes. Striking vitals, using performance-enhancing drugs...

Spectators bet on a single player. It is a form of gambling where they win or lose money based on the outcome. Occasionally, if they take a liking to a player, they can pay a massive sum to take them away. Players receive a portion of the betting pool if they win, so most players are those in need of money, while spectators are those seeking entertainment or profit.

There have been cases where a spectator, having lost a fortune on a bet, murdered the player in a fit of rage. So, if you value your life, you'd better do your best to win—!