Simulator RPG featuring anthropomorphic World War weapons

A long time ago, 200 years ago, a mysterious ore-like life form "Resetter" suddenly appeared, causing destruction and disaster, as if ridiculing human beings who had achieved high industrial development. In front of them with a special protective wall called "insulation layer", conventional weapons could not stand their teeth, and human beings on the other side of the war were deprived of their living sphere and overrun ...

The endangered humans hid themselves in a fortified city, the City. And the "Ashes Church" that gained control of the "City" is a study of girls called "DOLLS", an artificial life form wearing black iron armament that can counter the "resetter". Succeeded in development and sounded a counterattack gong.

The story of the counterattack spun by the girls who are tasked with fighting while being born is about to begin.