Okay... fantasy story lining time.
YFCz at the Budokan on 7/4 isn't a break up and goodbye concert.
It's a graduation.
Someone is leaving and they're going to run with the theme as a graduation and go completely over the top with it, mimicking the typical girl group graduations (they have the right venue for it, after all) and starting YFCz Third Second Generation.
Basically, a big exercise in trolling, just as they did when they started this band properly nearly a year ago and have done ever since.
Of course, GACKT will shed some manly tears like he always does on his birthday, but so should the person graduating!
Now, I know nothing more about this live than what little was announced on the website, but that's what I'd like to see because it would be hilarious XD