Gunbuster! (or Aim for the Top!) is a 6 episode mecha OVA and the first work of Hideaki Anno as a director. It focus's on Noriko's fight against the space monsters and her rise to courage. A sequel OVA called Diebuster! was released 20 years later, which is set just before the epilogue of Gunbuster! and stars Nono. The series is excellent and somewhat underrated.