This is the end of BGC2040: the last five episodes on disc 6. Galatea completes her conquest of Tokyo and sets her eyes on a bigger prize: Earth and all of humanity. While disc 5 was rather aimless, this disc picks up the pace again. The first episode is still a little slow, but once the battle picks up again, there are only brief interludes, which are used to good effect for character interaction. Unlike a lot of shows, the ending doesn't rewrite the rules of the game; rather, the battle with Galatea builds on a lot of the revelations made about boomers in volumes 4 and 5.
Technically, these episodes are top-notch. The last two, in particular. These two were not aired on Japanese TV and probably benefited by having bigger budgets. An unfortunate side-effect is that the creators decided to throw in some nudity in the last two episodes for no reason. It's all either long distance shots or really weird angles, so it probably wouldn't be terribly offensive to anyone, but it's rather pointless. That nitpick aside (and for some, it won't be an issue), this is a satisfying ending to a really impressive series.