Lol, I just wrote about volume five last week. Anyway, these two chapters seem to be a modified episode 13 (about maybe half of it so far, anyway).
And here's my understanding of what is going on:
-Nia talks to Simon, but then Yoko interrupts. Then I guess Nia is inspired to take a job as the chef. Oh boy.
-Enemy attack! Now Viral is in charge of the big flying thing (Cytomander is already dead)
-Someone at my source says that Viral is now immortal. Ooh.
-Yoko walks past Gurren, but Boota does something to her. He steals her bra and she chases him all the way back into Gurren. And just in time, too: Simon is prepared to fight, but Rossiu is sick in bed (gee, I wonder why). So Simon lets Yoko tag along for the fight.
-Of course, Simon is able to make Gurren Lagann fly.
-At the end of chapter 30, Yoko is injured and Viral is looking down at her and Simon. To be continued...
Here is the front cover of the monthly (anthology?) that features chapter 30:
I suppose I'll show the opening part to chapter 30. Yoko fanservice time!
Any questions?