Yes that was a great read. I'm glad the detective got his just desserts. I was worried we were supposed to sympathize with him because he was killing the villains but I found him to be a creep. An entertaining creep, to be sure, but I think having him win the fight against the hospital harem girl would have been going too far.
The ending seemed to imply that the entire thing you just read was made in the shitai style. Another great twist end from the master of guro manga. I liked this even better than Fraction, and the extra stories were great.
I enjoyed the second to last chapter the most, while the ending somehow let me down, but I admit that it comes really unexpectedly, like some kind of inception, the ending of the story telling the story. Maybe the description of the mechanics of the shintai anime were a bit too much longwinded (if not unneeded at all).
The extra chapters are nice and obviously messed up as one would expect from Kago.