Ninja Gaiden is an action video game released for the Game Gear in 1991 by Sega with license from Tecmo. It stars Ryu Hayabusa and is part of the Ninja Gaiden series, although it features a plot not connected to any of the other Ninja Gaiden games. In this game, Ryu Hayabusa must stop an evil organisation from starting World War III after an attempt to steal his sword was made in his home village. The gameplay is similar to previous Ninja Gaiden games where the player jumps between platforms defeating and avoiding enemies.
At the start of the game, Ryu Hayabusa is responding to an attack in his village as he rushes to a shrine where the leader of attack was holed up in. Defeating him, the leader reveals that he was hired by a man named Tonpenkof who was a smuggler who sells weapons to a variety of clients. Attempting to find out why would someone would steal the Dragon Sword, Ryu infiltrates the boat and kills Tonpenkof, revealing a man named Mr. Tsin who he was selling weapons to in Hong Kong. Ryu defeats Mr. Tsin but not without being captured and brought to India where the person who wants the Dragonsword to start World War III is reveals himself to be Shiragane, a demon capable of mind control and with the power of the Dragon Sword, can effectively have almost unlimited power in dominating over the minds of others. Ryu kills him and brings an end to another threat of the world.