Based on a Thread of Magical Girls Vs Mecha.

Zero, a freshly graduated soldier who just been recruited to defend earth against the invading force of unknown forces known as Magical Girls. Beings of immense powers that defy logic and given immense beauty, they slowly began to overtake the world as we know it if not for the soldiers who pilot Giant Mechas to face off against them

Given that the success rate of their fights had beena constant losses, they still strive to push those beings back. However, He who had just joined his first battlefield, had suffered an immense loss against the numerous magical girls. Right as he was about to escape, he was now being chased by one.