Desperate Black Cat Air Force

A long time ago, several large holes suddenly appeared in the sky above the desperate land, and various items fell from the holes. Along with the dropped items came aliens who called themselves "Yohan", "Emeric", "Deis", "Lucia" and so on. Towns have been built in previously uninhabited places, and oil wells and factories have sprung up in this wild land. In particular, objects called "airplanes" are quietly changing people's lives. Although the cave entrance was later closed, the technology and knowledge they left behind took root here. Airplanes allow people to soar in the sky, and coupled with almost inexhaustible oil, they lay the foundation for the development of aviation. The era of great aviation in a desperate place has arrived.