(I found a mecha-battlesuit in the ruins and now we survive together in this horrible world)

Sold to slavers from birth, a girl makes a final all or nothing bid to escape her old life and to chase her single dream or die trying in the attempt. Delving into a forbidden layer of the local ruins, she finds something unexpected. Something that will change the course of her life forever.

(Minimal LitRPG) (Single mecha in a dark-fantasy world) (Greedy protagonist) (Slow start)