Himitsu: Kuro no Chikai Anime Details and Episodes Rin, a young angel (presumed female, but angels don’t have clear genders) falls in love with a young human girl, Miku. However, their love is considered… Series info Watch free DetailsFormatNovelStatusFinishedSourceOtherCountryJapan GenresDramaFantasyRomanceSupernatural TagsAgenderMemory ManipulationArranged MarriageTomboyMaidsMedievalRoyal AffairsGunsReligionIsekai RecommendationsHatsune Miku no ShoushitsuLife Reset ButtonYowamushi Mont BlancHimitsu KeisatsuAku no MusumeRin-chan Now! SSsAku no Taizai: Nemurase Hime kara no Okurimono CharactersMiku HatsuneRin KagamineLen KagamineLuka Megurine (Supporting)Meiko (Supporting)