Kouya no Kotobuki Hikoutai Gaiden: Oozora no Harukaze Hikoutai
荒野のコトブキ飛行隊 外伝 大空のハルカゼ飛行隊
★ 5.8 Completed ONA 2019
Synopsis
A short spin-off anime released on "Kouya no Kotobuki Hikoutai: Oozora no Takeoff Girls!" game app and YouTube.