That soundtrack is so amazing, it impresses me every week it actually utilizes it (it didn't for a couple episode). The last few episodes have been wonderful, and depending on how it ends, it could end up as my favorite of the season. It started off one of my favorites, kinda went iffy with the Makai suddenly being used in epsidoe 5, weak stuff for a couple weeks, then now full blown amazing again.
Is it just me, or is Togo a Homura clone?
Also, apparently, there's a prequel to the series, though, to put it more appropriately, the anime is a sequel to this one volume novel. That means this entire plot happening has been planned since before the anime started.