Watch 12cm Promise with a Cool Girl Watch now on Miruro - Free Anime Streaming A boyish childhood friend grows up to be a super handsome girl! Series info Watch free DetailsFormatMangaStatusAiringScore66/100SourceOriginalCountryJapan GenresComedyRomance TagsSchoolTomboyHeterosexualMale ProtagonistPrimarily Teen CastJosei RelatedKakkoii Onna no Ko yori Kakkoyoku Narou to Suru O-hanashi (Alternative) RecommendationsTomo-chan is a Girl!How I Attended an All-Guy's MixerTonari no Kinniku JoshiOn and Off: Work-Life ImbalanceWolf-chan wa SumashitaiMy Androgynous BoyfriendOnee na Kareshi to Boyish Kanojo