Yi Cheng Za Yin

In the ruins of the city, the post-apocalyptic JK Candy pilots her mecha to battle monsters. However, behind the human-turned-monsters lies a even more terrifying conspiracy... Each faction has its own ulterior motives, and the story will unfold around the young man Naiicca, as a vicious war breaks out over his "goods"!

(Source: Bilibili, translated)