Zaion ~I Wish You Were Here~ (anime show)

Description: In the year 2000, a meteorite falls on a mountain North of Texas in the United States. This meteor carried a deadly new virus known as "M34." M34 yielded horrifying results, turning people into monstrous creatures upon infection. Worst of all, the virus was contagious, spreading all over the world and becoming humanity's ultimate threat. As M34 spreads, many organizations are created to fight off the virus. One of the groups, NOA, has created a nanomachine used in order to fight off the M34 infection. But the virus grows even stronger, leaving the fate of humanity in the hands of a 16-year old girl named Ai, who mysteriously has the power to fight off the M34. She joins Yuji, an NOA soldier on a mission to save humanity from the M34.