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Kouya no Kotobuki Hikoutai Gaiden: Oozora no Harukaze Hikoutai
Kouya no Kotobuki Hikoutai Gaiden: Oozora no Harukaze Hikoutai, The Magnificent Kotobuki Side Story: The Harukaze Squadron of the Great Sky, The Kotobuki Squadron in the Wilderness Side Story: The Harukaze Squadron of the Great Sky, The Harukaze Squadron of the Great Sky, 荒野のコトブキ飛行隊 外伝 大空のハルカゼ飛行隊
A short spin-off anime released on 'Kouya no Kotobuki Hikoutai: Oozora no Takeoff Girls!' game app and YouTube. (Source: AniDB)