Kouya no Kotobuki Hikoutai Gaiden: Oozora no Harukaze Hikoutai
Watch Kouya no Kotobuki Hikoutai Gaiden: Oozora no Harukaze Hikoutai full episodes online
Other name: 荒野のコトブキ飛行隊 外伝 大空のハルカゼ飛行隊
Plot Summary: A short spin-off anime released on “Kouya no Kotobuki Hikoutai: Oozora no Takeoff Girls!” game app and YouTube.