Whileplayinginthesnowonedayathershrine,thelandgodNanamiMomozonowitnessesherfamiliar—thefoxyoukaiTomoe—collapse,withdarkmarkingsappearingonhisbody.Tomoe'sformermaster,LordMikage,appearsafterhislongabsenceandplacesTomoeintoamagicalpocketmirrorinordertostaveoffhisailment. Mikageexplainsthatlongago,beforeheandTomoehadmet,thefoxyoukaiwasinlovewithahumanwoman.Seekingtoliveasahumanwithhisbeloved,hemadeadealwithafallengod,butheonlyendedupcursedanddying.WhenMikagediscoveredTomoe,thegodmadetheyoukaiforgethishumanloveasaquicksolution.However,somethinghaschangedrecentlytoreactivatethecurse;Tomoehasfalleninlovewithhisnewhumanmaster,Nanami.Sincethereisnowaytostopthecurse,NanamiwantstostopTomoefromgettingcursedinthefirstplacebytravelingbackthroughtime,evenifitmeanstheymaynevermeet.AsNanamitravelsbackhundredsofyearstosaveherpreciousfamiliar,shediscoversthatsheisfarmorecloselybondedtoTomoethanshepreviouslythought.