we get to see anieze fall in love
then the introduction of the latin word.. la superiore or something I'm not so sure but I love that volume. First time seeing itsuwa in a finalize way. Then the anieze faction together with the amakusa joined forces.
We also get to see touma vs a water vessel fleet.
EDIT:
no seriously, I like vol 11 more than vol 8 and 9+10. I like vol 9 and 10 and read up to date translation of teh_ping but for vol 8 I just read it after teh_ping finish the last chapter so I can read touma gar and accel badarse mode.
I love vol 11 up to the point I tried to read the atlast translation of it just like vol 13 and 14.