Katasumi no Heartbeat Anime Details and Episodes All my life I've always played a supporting role, and I thought that's where I'll always be… (Source: Margaret, translated) Series info Watch free DetailsFormatMangaStatusFinishedScore58/100SourceOriginalCountryJapan GenresRomanceSlice of Life TagsShoujoFemale ProtagonistHeterosexualSchoolEpisodic RecommendationsHana ni KamiguseOneshot RomanceKyou, Sekaiichi no Kokuhaku wo.