Sengoku Ace is a vertical-scrolling shoot 'em up game originally developed by Psikyo. Set in a fantastical version of Japan's Sengoku period, the game features unique characters and intense action as players battle various enemies. Sengoku Cannon: Sengoku Ace Episode III is a sequel in this franchise, but the main/master title is simply Sengoku Ace, which serves as the foundation for the series.