Steel Winged Angel's Action Plan

A warrior with steel wings, a machine? Or a girl? The arrival of the sub-dimension is invading the world here, and the steel-winged angels resist the alien invasion. The system called Eutopian connects to the souls in the depths, providing them with an endless supply of energy, which turns into the roaring sound of battle cannons and protects the highly developed utopian world. What is the truth? How can we find peace in this world? Let's look at Yun Che, a young man from the 21st century on earth, traveling through time to explore this mysterious and unknown world.