Machine-equipped chief Eyre (Note: This appears to be a partial or unclear Japanese phrase. A more literal reading could be "machine-equipped long Eyre" or "motorized chief Eyre," but the exact meaning depends on context.)

Eir, a fighter jet mechanic sent to the desert as part of the UN military forces. One day, while she was performing aircraft maintenance, Brunhilde, a peerless female pilot she never wanted to see again, shows up?! A prequel and sequel to "The Eldest Sister of the Valkyries" https://ncode.syosetu.com/n9230fj/ *Contains some light depictions of fighting.