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 · Trending anime · Airing schedule FormatMangaStatusFinishedScore58/100SourceOriginalCountryJapan Romance · Slice of Life Shoujo · Female Protagonist · Heterosexual · School · Episodic Hana ni Kamiguse · Oneshot Romance · Kyou, Sekaiichi no Kokuhaku wo.