You are Kenzo Sasaki, a martial arts master trained in the ways of the ninja. You live in the Japanese countryside in a secluded village untouched by time or the outside world since medieval times. There are stories about a temple that holds secrets and Magical Artifacts inside, but you believe them to be myths, seeing as no one was able to Escape the temple and save the newfound knowledge.
An organized crime syndicate from a nearby city discovers the existence of your town and hears the rumors of the Magical Powers contained in the temples. The leader decides to capture the temples and harness the power of the artifacts hidden inside to increase the lethality of his mafia.
Being that no one in your town had been in contact with the outside world or expected attacks, the crime group is easily able to take the temple grounds and set up a base inside. They defend the temples and search the insides to locate the ancient secret powers hidden within.
You as the ninja are the last hope of stopping the gang. You put on your uniform, sneak inside the temple, discovering that the legends are indeed true and a maze of maddening Doors and passageways which you could never have dreamt up lies in front of you.