▁by : ▁Ry ū z ab ur ō ▁ Ō t omo ▁Gi ri ▁is ▁the ▁series ' ▁main ▁ant agon ist . ▁After ▁having ▁been ▁se aled ▁by ▁G ur ug uru ▁magic ▁for ▁ 3 0 0 ▁years ▁( d uring ▁the ▁reign ▁of ▁King ▁U ru ga ▁III ) ▁he ▁finally ▁returned ▁and ▁is ▁un le ash ing ▁his ▁army ▁of ▁mon sters ▁to ▁take ▁over ▁the ▁world . ▁Since ▁his ▁only ▁weak ness ▁is ▁G ur ug uru ▁magic , ▁he ▁does ▁all ▁in ▁his ▁might ▁to ▁destroy ▁K uk uri , ▁the ▁last ▁G ur ug uru ▁user ▁in ▁existence . ▁He ▁is ▁always ▁dep icted ▁sitting ▁on ▁a ▁big ▁arm ch air , ▁completely ▁hidden ▁in ▁a ▁dark ▁clo ak ▁with ▁only ▁his ▁red ▁eyes ▁g low ing ▁through . ▁In ▁his ▁demon ic - looking ▁hand ▁he ▁always ▁holds ▁a ▁glass ▁of ▁wine . ▁ ▁Ra id ▁Vo iced ▁by : ▁Nob uh iko ▁Ok am oto ▁( 2 0 1 7 ) ▁He ▁is ▁a ▁hand some ▁demon - pr ince ▁who ▁is ▁fond ▁of ▁K uk uri . ▁His ▁special ▁name ▁for ▁her ▁is ▁" P ink ▁Bomb ," ▁and ▁he ▁contin ually ▁tries ▁to ▁split ▁her ▁away ▁from ▁N ike ▁to ▁fall ▁in ▁love ▁with ▁him . ▁His ▁magic ▁attacks ▁are ▁powerful , ▁but ▁often ▁involve ▁complicated ▁inc ant ations ▁and ▁unusual ▁results , ▁such ▁as ▁g astr ic ▁dist ress . ▁ ▁Rat men ▁They ▁are ▁very ▁low - rank ed ▁type