Takes place during Japan's Sengoku Era, a time of great civil war. Intertwined in the war are the forces of mythology, as the monsters have risen up in this time of strife and bloodshed.
You will take on the role of Kuruhito, an oni (ogre or demon) who onced served the Demon Shogun, the greatest of the monsters. He has come to sympathise with humanity and as a result has turned on his master, becoming a ronin. He now seeks to bring down the Demon Shogun, even if he has to cross all of Japan to do so.
Read the manual to get confused only to jump into the game and see that it is simple arcade.
Developer: Howard Kistler
http://www.dreamcodex.com/devilronin.php