The events in Ninja Gaiden II take place one year after the events in the first Ninja Gaiden game. It is about an evil emperor named Ashtar who, after hearing of Jaquio's defeat, devises a plan to take over the world and engulf it in darkness through an evil sword called the Dark Sword of Chaos. A U.S. Army agent named Robert T. Sturgeon recruits the game's main protagonist Ryu Hayabusa and tells him that he is the only person who can stop him. (wikipedia.org)
