Although Diebuster can serve as a stand-alone series, it will make more sense if you watched Gunbuster. That being said, Diebuster is way better than Gunbuster... which is largely a reflection of the time discrepancy between when the two series were created. I decided to watch this show because of all the scenes that are used in Nostromo AMVs (if you dont know who that is, you should youtube some of his AMVs), and was completely satisfied with the second series in the Gunbuster universe. There a lot of lighthearted moments and you may notice a sprinkle of some FLCL-esque style animation, but the action and the comedy are balanced nicely. If you like space or mech themed anime, I would recommend watching Diebuster. Moreover, if you want to completely understand the series, you should watch Gunbuster... but only watch that series if you don't mind old styles of animation. (show less)