In 1903, a manned airplane successfully fllew in the sky. Yes, that was the moment when humans got wings.
As tensions between countries flared, airplanes were used as weapons. WWI finally broke out in 1914... eventually the war ended, but a lot of countries still held animosity with each other.
In 1923, Erika, a mechanic, and her family lived in Juktland. Her father, Anthony, was also a mechanic. Though he was old, he was still called the 'God of Repair'. Erika was also a good mechanic. One day, Anthony received a command from the Juktland Army. It was to be a airplane mechanic for the Roby Independent Aerial Platoon. Erika didn't want him to overwork himself, so she said, "I'll go in behalf of him." Like this, she was sent to an air base near the border. However, when soldiers first saw her, some despised her, some expected something from her, and some felt disappointed... No one treated her as a full-fledged mechanic... She finally said, "I'm here as a mechanic. Give me something to do!"

[Edited from Himeya Shop]