The NES trilogy consists of the following games: * Ninja Gaiden (NES) is the first game of the series. It follows Ryu Hayabusa on his journey through America. Having received a letter from his father to go to America and find Dr. Walter Smith should he not return, Ryu honors his father's wishes and heads there. Once in America, he encounters the Jaquio who wishes to release The Demon inside a statue. Ryu defeats the Demon after a long battle. * Ninja Gaiden II: The Dark Sword of Chaos is the second in the series. One year after the first game, Ryu finds that his girlfriend, Irene Lew, has been kidnapped by the dark wizard Ashtar. Ryu pursues him to find that Ashtar has stabbed Irene and that Ashtar's sword feeds on chaos. After they clash, Ryu defeats Ashtar but he sends his sword a