Post-2004 Series
The story along with its sequels Ninja Gaiden: Dragon Sword and Ninja Gaiden 2 have been established as a retcon, taking place before the NES Ninja Gaiden Series. The main story of the game involves Ryu Hayabusa setting out on a quest to retrieve the Dark Dragon Blade from the hands of evil after most of his clan was wiped out.
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“I look on trade and every mechanical craft as education also. But let me discriminate what is precious herein. There is in each of these works an act of invention, an intellectual step, or short series of steps taken; that act or step is the spiritual act; all the rest is mere repetition of the same a thousand times.”
—Ralph Waldo Emerson (1803–1882)