Gunbuster, known in Japan as Aim for the Top! (トップをねらえ!, Top O Nerae!) is a six episode anime OVA series created by Gainax in 1988. It was the directional debut of Hideaki Anno, who is best known for his role as the director of Neon Genesis Evangelion. The title is a parody of the classic tennis anime Aim for the Ace!.