Funimation previously picked up the fall 2021 title from Science SARU with The Heike Story and it’s definitely unusual in how this is coming out.
The series is scheduled for a January 2022 debut in Japan as part of the +Ultra block on Fuji TV but Funimation began streaming it on their service back on September 15th, 2021 along with service in Japan.
The series is directed by Naoko Yamada based on the scripts overseen by Reiko Yoshida.
The Genji Attack | The Heike Story Official Dub Clip