Long, long ago the world was in a state of chaos, where demons
caused evil & tormented all. That changed when Solomon, a great
king & magician, invented a magical formula which he wrote inside
a secret book called "Solomon's Key". This book arrested and
sealed away all evil demons into a constellation sign which was
hidden. "Solomon's Key" restored light and peace to the world.
Upon hearing this legend, a taoist monk searched for a long period
of time to find "Solomon's Key". After locating the constellation
sign, he discovers the "Key". Once in his grasp many dreadful
demons were freed from the magical power of this book. The world
was brought back to chaos and darkness. Everything on earth was
now under control by the demons just like the pre-creation days.
King Yutra from the fairyland called "Lyrac", ordered the wizard,
Dana to restore order back to the world. Dana accepted this
mission and stepped into the forbidden land of the "Constellation Sign".
--From the NES Solomon's Key instruction manual.