Although each of the games in the series do not seem to follow a connected plot, the games all involve the undead forces of feudal Japanese warriors attacking the protagonists.
In the first two games, the player could play as a ninja or a western cowboy. In the games, the player can gain powerups so that the player can change into a more powerful samurai-like being to attack the opposing forces of the undead.
The third game did not have a similar premise to the previous two games; instead, it was about a ninja clan who had to stop a worldwide outbreak of the Japanese demons before the world would be engulfed in chaos.
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