Gunbuster 2: Diebuster Episode 4: Resurrection!! The Legendary Buster Machine!
Episode 4 of 6 of Gunbuster 2: Diebuster, aired October 28, 2005, 30 minutes. Available with English subtitles and dub where released.
Episode summary
Nono`s despair grows as her certainty that she`ll get a Buster Machine fades. She`s sent to Pluto to recover an old Buster Machine, but there`s more going on than a salvage operation... and to Nono`s heart! Source: crunchyroll