Details from the website are sparse so I'm just double checking that this is actually the Blu-Ray Ltd Edition but from first glance it looks to be. Availability - Despatched in 3 days.
The first commercial success from the fan turned pro studio Gainax and the directorial debut of acclaimed creator Hideaki Anno (Neon Genesis Evangelion), GUNBUSTER casts pretty girls and giant robots in a moving tale of interstellar naval war and is a story of a young girls struggle to pilot the ultimate weapon. About DIEBUSTER (a.k.a. GUNBUSTER 2)The epic sequel directed by Kazuya Tsurumaki (FLCL) is set thousands of years after GUNBUSTER, and focuses on a space pilot wannabe named Nono from a lonely snowbound village. Her efforts lead her to join the elite teenage pilot group called Topless in order to defend the Sol System with their superpowers.
This collection includes the two GUNBUSTER films. GUNBUSTER (1988) is Hideaki Anno's first directorial triumph, and focuses on the adventures of Noriko Takaya, a young girl who enrolls in a school for space pilots and finds herself responsible for the fate of the world--a futuristic, anime world full of giant robots, elite naval fighting forces, and interstellar space monsters.
GUNBUSTER 2: DIEBUSTER (2004) follows a young girl named Nono who has left her home behind to come alone to the big city to pursue her grand dream of becoming a space pilot. But reality is harsh, and she spends every day instead at the diner near the spaceport where she lives and works. Then one day, while being harassed by one of the regular customers, a real-life space pilot named Lal'C comes to her aid. Lal'C is a member of 'Topless', a team of elite, psychic pilots who operate Buster Machines whose mission is to protect people of the Solar System from space monsters. During a monster attack, Lal'C witnesses Nono's superstrength which helps her defeat the alien.