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Ninja Gaiden (忍者外伝, Ninja Gaiden? lit. "Ninja Story"), known in Japan as Ninja Ryūkenden (忍者龍剣伝, Ninja Ryūkenden? lit. "Legend of the Ninja Dragon Sword") and as Shadow Warriors in Europe, is a platform game for the NES developed by Tecmo. Originally released in Japan towards the end of 1988, it was the first in a popular trilogy of Ninja Gaiden titles for the NES featuring the adventures of Ryu Hayabusa.

The game is renowned for its innovative use of cinematic cutscenes. It represents one of the first NES games to feature a full, movie-like story. The game's success spawned two sequels and several ports to other video game systems.

Story

Ryu Hayabusa of the Dragon Ninja Clan receives a letter from his father, saying that he was leaving for a duel with an unknown warrior. Should he not return, Ryu was to go to America and seek a man named Walter Smith. Ryu honors his father's last request, and travels to America. While there, he is kidnapped by a CIA agent and given a statue of a hideous beast.

Eventually, Ryu finds Walter Smith, an archaeologist, who tells Ryu of the Demon Statues that he and Ryu’s father had found, and how they had to protect them. Ryu shows Walter the statue he has. Ryu's father had the other statue with him. During the conversation, a masked figure suddenly breaks into the cabin and steals the statue. Ryu gives chase and retrieves the statue. When he returns, he finds that Walter has been killed, and a moment later, Ryu is captured by three armed men.

Ryu is taken to an interrogation room, where he is addressed by a man named Foster, the director of the CIA. He explains to Ryu that they have been monitoring the activity of someone named The Jaquio. Jaquio wishes to gain the statues so that he can release the Demon trapped in them, bringing out the end of the world. He orders Ryu to eliminate Jaquio.

Ryu parachutes into the jungle of Brazil, and makes his way up the mountains to the temple, where he finds Jaquio. Jaquio is killed during the ensuing fight, but the Demon has already been awakened. Ryu is able to defeat the Demon after an epic battle.