Parasite eve series is based on the Mitochondria theory, all humanity is descendant from a woman in Africa that is called Eve.
Apart from that the Mithocondria is treated as an entity of it's own than can even take control of the host since it contains little changes in the DNA(or is RNA) inside it and there is not enough research on what it can really do.
Parasite Eve 2 is more related into using the power of the Mitochondria for boi weapons







