Key of Heaven

Three hundred years ago, the known world consisted of 9 continents spread across a vast ocean. The center of this world was Ohka, a wondrous continent rich in Oriental mysticism. Ohka was ruled by five Bumon, or houses of martial arts, each boasting their own unique fighting style.
 
However, Sema, a continent far to the west whose invading forces were led by the Demonic General, threatened their rule. Following a fierce battle, the five Bumon finally brought the war to a close, sealing the Demonic General in Ohka by means of a mysterious Key. With the war thus ended, all believed that peace would reign eternal....