Zaion : Devastation (Vol. 2)

In the near future, a meteor strikes Earth, releasing the M34 virus, which causes humans to mutate into monsters. Humanity's only weapon against the monsters are the young men and women of NOA (Nano Osmolar Armor), microscopic machines that allow them to function as human mecha have been infused into their blood. Yuuji, NOA's ace warrior, is sullen, alienated and hot-tempered. When the monsters reach Stage II and meld into huge, metamorphic creatures even NOA can't stop them. The new secret weapon is Ai, a wistful teenage girl who can project Deva, an enormous laser light hologram that zaps Stage II monsters. Naturally, she and Yuuji are attracted to each other, despite the generals' objections.