Collider has rounded up the best new and returning anime series arriving on Netflix and Crunchyroll in September, as the summer season wraps up ahead of the autumn anime schedule. The selection mixes brand-new instalments with the continuation of ongoing fan favourites, giving viewers a mix of historical fantasy, long-running franchises and ensemble romance to watch before a fresh crop of shows debuts in the autumn.

– Red River (Crunchyroll, 29 September) – the historical fantasy's second cour begins, bringing the adaptation of Chie Shinohara's manga to 24 episodes as heroine Yuri navigates ancient political intrigue.
– Pokémon Horizons (Netflix, 18 September) – new episodes continue Liko's journey as a Trainer, tied to the mystery of her grandmother's pendant.
– STEEL BALL RUN JoJo's Bizarre Adventure: 2nd-3rd STAGE (Netflix) – a highly anticipated new instalment in the long-running franchise.
– Clevatess, Re:ZERO -Starting Life in Another World-, The 100 Girlfriends Who Really, Really, Really, Really, Really Love You, and You and I Are Polar Opposites (all Crunchyroll) – continuing weekly episodes of these ongoing series.