A hostage situation involving heavily armed criminals unfolds in a park, but the police receive orders from higher-ups not to intervene. The reason is that these robbers are former members of the large international terrorist organization "SIN," which wishes to handle the matter themselves and has dispatched a terrifying assassin. Chun-Li, Guile, and Cammy cannot tolerate the involvement of innocent hostages and forcibly break in. In the darkness, they discover a chilling purple glow... Who is she? And what schemes does "SIN" have in store?