Nope not the one, but I did check just in case. It sounds an interesting read. The books were a few years older than that one.
Trying to make sense of all the bits of them that I remember.
One of the female characters dies after being forced to "incubate" the head demon so he could be reborn but for some reason comes back but with a kind of plant like origin, like aloe for blood and what not. The four of them (the 5th I now remember was a kind of guidance councellor on how to use their new weapons/powers/transport) fight a group of different demons that were tormenting a village, basically they were going into houses and stealing the occupants for food, but they couldn't enter through a locked door, the things weren't strong enough and they discovered that they were able to get into some peoples houses because the local toffs' were breaking into them first so they could get rid of the "unworthy" i.e. single mothers, drunks etc. etc.
I hope this helps anyone else reading this also. It's beginning to become one of those things that I need to find the answer to as it is doing my head in!