Set in an alternate Earth in the now modern era. Back in 1939 an alien force know as the Neuroi have began invading on human territory, spreading a corrosive miasma. The Miasma doesn't go over large bodies of water, and doesn't effect a certain type of people, we now as Witches. Arming them with the latest equipment, it is now up to the Witches to fight off this Neuroi invasion.
Over the years, the technology has improved and expanded on, and the witches have evolved, as well as the edition of Warlocks. The Neuroi have also increased in power, new taking new forms and now being able to go under water as well as flying higher and faster. Can the 510th Joint Fighter squad overcome this battle..?