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Official Site: Gainax

Diebuster, known in Japan as is a six episode anime original video animation (OVA) series created by Gainax in 2004.

The first episode was aired on October 3, 2004, while the final episode was released on August 14, 2005. A movie, officially titled retells and recaps the end of the first Gunbuster OVA and the finale of Diebuster. It was scheduled to air on October 1, 2006 at the Tokyo Anime Center's 3D Akiba theatre.

Also called Gunbuster 2, it is the direct sequel to Gunbuster, but is animated in a 16:9 widescreen aspect ratio, rather than the 4:3 aspect ratio used in the majority of Gunbuster. It was licensed for American release by Bandai Visual USA as Gunbuster 2. Discotek Media has since re-licensed Diebuster as Gunbuster 2: Diebuster and will be released May 21, 2013. Additionally a manga adaptation of the series is available in Japan.

Top o Nerae 2! Diebuster follows the story of Nono, a country girl who dreams of becoming a space pilot (or to be more precise, 'like Nonoriri,' the meaning of which is revealed as the series progresses) who, due to a chance encounter with an actual space pilot finds herself becoming part of the elite Fraternity. Made up of teenage pilots called Topless, and armed with quasi-humanoid weapons called Buster Machines, the Fraternity's mission is to protect the people of the Solar System from attack by swarms of space monsters.

Nono has not been a contender in any CBUB matches.