▁owner ▁of ▁the ▁" V illa ▁Rosa ▁S as azu ka " ▁a partment ▁building ▁where ▁S ada o ▁Ma ō ▁and ▁Su z uno ▁Kam azu ki ▁live . ▁She ▁is ▁very ▁ob ese ▁and ▁seems ▁to ▁know ▁more ▁than ▁a ▁Japanese ▁person ▁should ▁about ▁the ▁visitors ▁from ▁En te ▁Is la . ▁It ▁is ▁later ▁revealed ▁that ▁she ▁and ▁her ▁nie ce ▁are ▁God - like ▁guard ians ▁of ▁Earth . ▁ ▁The ▁manager ▁of ▁F ush ima ▁Park ' s ▁M g R on ald ▁branch . ▁ ▁Al as ▁Ram us ' ▁younger ▁sister ▁and ▁another ▁fragment ▁of ▁" Yes od ". ▁She ▁lives ▁with ▁E mi ' s ▁father , ▁Nord ▁Justin ia . ▁She ▁later ▁f uses ▁with ▁Ma ou ▁to ▁help ▁him ▁become ▁more ▁powerful . ▁ ▁The ▁" d augh ter " ▁of ▁Sat an ▁and ▁Em ilia . ▁She ▁was ▁formed ▁by ▁" Yes od " ▁and ▁brought ▁to ▁Japan ▁by ▁L ail ah , ▁Em ilia ' s ▁mother ▁and ▁Sat an ' s ▁sav ior . ▁She ▁later ▁f uses ▁with ▁E mi ' s ▁sword ▁to ▁help ▁E mi ▁become ▁more ▁powerful . ▁ ▁Media ▁ ▁Light ▁nov els ▁The ▁Dev il ▁Is ▁a ▁Part - Timer ! ▁began ▁as ▁a ▁light ▁novel ▁series ▁written ▁by ▁S atos hi ▁W ag ah ara , ▁with ▁illustr ations ▁by ▁the ▁artist ▁ 0 2 9 ▁( On iku ). ▁W ag ah ara ▁originally ▁entered ▁the ▁first ▁novel ▁in ▁the ▁series ,