Far in to the future, when most of the continents on the earth sunk into the sea...
People have formed a unique civilization on the small patch of land that remains.
People's lives are sustained by explorers called "diggers". These warrior-workers dig out ancient ruins to collect a natural energy source called "Refractors." A precious resource, Refractors are necessary for sustaining life. The world wouldn't last long without them!
Mega Man and his friend Roll Casket are diggers who travel around the world seeking the Great Legacy. They also hope someday to find Roll's missing parents. Though finding the Great Legacy is the dream of most diggers, nobody knows what it really is. The myth surrounding the Great Legacy describes it as a new energy with infinite power. It would make Refractors obsolete forever, and bring beauty, harmony and ease to all people of the world.
Von Muller, the famous industrialist, fist explained the theory. He believed that Refractors would eventually drain themselves of power. But the Great Legacy could replace them in providing for all the world's needs.
Von Muller decided to fund a huge project to benefit the future of humankind. He spent his entire fortune building a magnificent airship, the Sulphur Bottom, which he planned to pilot to the "Forbidden Place". This unknown territory was thought to be the location of the Great Legacy. But no one had ever entered it.
The Sulphur Bottom's expedition team would be the first!
The great day has arrived. The Sulphur Bottom is being launched.
As a press conference is being held in the mighty airship, a woman appears with a white Reaverbot.
Who is this mystery woman and her strange companion? What is the meaning of this singular occurrence? Is it a coincidence... or a foreshadowing of danger? The Adventure of the Great Legacy is about to begin!