Theonewhocreatesandcontrolsdevilsanddemons,theonewhobuildsandreignsoveradungeonofmalice,anexistencethatwaschosentohaveanoverwhelminguniqueskill—thatisaDemonKing.
　　TheDemonKinginvitespeopleintothedungeonthatitcreatedand,usesthedespairitreceivesasnourishment.
　　But,DemonKingofCreationProcellchosetousehopeinsteadofdespairashisnourishment,notadungeonofmalicebutadungeonofhappiness,atownwasbuiltandlotsofhumansgathered.
　　However,thetownhemadeistooattractive,anditwillbemarkeddownbyotherDemonKingsandalsohumans.
　　Withoutanyotherchoice,hedecidedtousehisuniqueskillandknowledgetoformthestrongestultra-powerfuldemoncorps,makeanundergrounddungeonandsetdangeroustraps,andontopofthat,makeawealthycity.DemonKingProcellreignedshowingkindnesstothosewhosupportshimwhilebeingruthlesstowhoeveropposeshim.
　　Thisstoryisaboutthetwo-facedeccentricDemonKing.