Man, was this a long, intense churn. Narita is not the kind of author who generally goes for lengthy, character-arc focused writing, but in between all the sword fights and car kicking and parkour, Dulalala 6 boils down to a slow burn effort to shift Mikado's character from a passive to a proactive role in the series. Honestly, for a while there I wasn't sure he was ever going to pay it off. It's not until the last few pages of the book that the other shoe finally drops...and we have to wait till Dulalala 8 to find out where he's going with THAT. (Dulalala 7, out early 2010, is supposedly random side stories.)
While I think I tend to prefer Narita in his less ambitious crazy good time mode, I definitely dig it when he reaches a bit higher, and pulls it off.