Ryu was warned about the dangers of the Dark Hadou, a corrupting energy that can overwhelm a warrior and transform them into a heartless killing machine. However, Ryu's pursuit of fighting perfection appears to be leading him toward the Dark Hadou, culminating in a battle with a man named M. Bison. Fortunately, Ryu has his best friend Ken and rookie Interpol officer Chun-Li to help ensure his soul does not become permanently corrupted.