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Ninja Gaiden (忍者外伝) for the Sega Master System is a platform action game developed by SIMS and published by Sega in 1992. It is unrelated to the other Sega versions and is an entirely new release for the Master System, despite title screen claiming it was "reprogrammed by Sega".
Ryu Hayabusa is a descendant of clan of Dragon Ninjas who have kept the peace in Japan for generations. One day he received the news that his home village, the Dragon Village, was attacked by someone. He hurried home to take care of things.
But he returned home only to find that he was too late. He could do nothing but stare at the rubble that was once his village.
Ryu found the sole survivor in the village. With his last few words, the survivor told Ryu that the Bushido had been stolen.
The Bushido is an ancient scroll that have been handed down through generations of Dragon Ninjas. This document contains secrets about ways to summon the powers of this world. According to Ryu's ancestors whoever summoned these powers could even conquer the world.
Ryu whipped out his Dragonsword which is also endowed with such powers. He swore to himself that he would regain the Bushido and take revenge for his village.