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Bloody Planet

Aliens attack a town with terraforming nanomachines, and Iwan is stuck in the middle of it. Everyone else he sees is eaten by the alien technology, until he runs into two girls who claim to be demons dispatched from hell. He sells them his soul as the price for helping him escape, but even with their help, he isn't sure he's going to make it out alive.

(Source: Manga Helpers)