X Maiden
Genres: Comedy, Slice of Life
Type: ONA, Episodes: 8
Aired: Feb 28, 2014 to Jun 20, 2014
Source: Game
Rating: PG-13 - Teens 13 or older
Synopsis:
In 20XX C.E., a mysterious alien race named Firow suddenly appears on Earth. The Firow's dreadful attacks force humanity to engage in a difficult battle. But humanity's last hope, the X Maiden who wear weapons built to destroy the Firow, are about to set out.

(Source: ANN)