M3: Sono Kuroki Hagane Anime Details and Episodes 10 years in the past, the city of Tokyo was consumed by an unknown darkness. It started off as a black speck in the sky. As it grew in size, it consumed… Series info Watch free DetailsFormatMangaStatusFinishedSourceAnimeCountryJapan GenresActionHorrorMechaSci-Fi TagsShounen RelatedM3: Sono Kuroki Hagane (Source) RecommendationsI Got a Cheat Skill in Another World and Became Unrivaled in The Real World, TooDARLING in the FRANXX