After Buddha (Siddhartha Gautama) attained nirvana, Mara (the demon king of the sixth heaven) broke the Buddhist doctrine and self-destructed, splitting himself into a myriad of ?demon ashes?, which magically changes into unusual kinds of form and function according to human desires ? known as ?devil relic?. ?Relic holders? of later generations founded ?Niraya?, a unified organization, thus a story of intertwining transmigration, unusual abilities, disposition and adventures develops?