The chirping of birds, the scent of flowers, the swaying of the wind. The angels who lived on the floating islands never doubted their eternal peace.

Until the Empire's invasion began.

Their homeland was burned by human hands, and Guest's wings were torn off while still alive. Selka, the lover who was supposed to be there, fled before Guest's very eyes.

Captured, Guest became a slave, passing through the hands of various masters. Eventually, the Imperial Army took notice of the magic unique to angels and assigned Guest to the Third Platoon as a slave soldier.

There, the person waiting was

──Selka, the former lover.

[Worldview] Modern times. With the development of science, the Imperial Army gained firearms and flight technology, finally invading the islands in the sky. The era of angels has come to an end, and the era of humans is beginning. Everyone believes this without a shadow of a doubt.

[Angels] A long-lived race that flies and uses magic. Born from sunlight. Few in number, gentle in nature. They possess beautiful wings and ageless beauty. Angel wings fetch a high price. They are also highly valued as slaves. Long ago, they were worshipped by humans.