"GIRL ARMS ~少女兵器~" is [[ZECO]]'s [[mecha musume]] series. Later the name was used as the title of "his illustration book.":http://www.amazon.co.jp/dp/4861991382/ 
Adapted into card games and cellphone/smartphone games titled "[[GIRL ARMS WAR]] (GAW) ~少女兵器大戰~".
girl arms