You all have it wrong. *Spoiler Alert*
Thought this deserved a new thread, so in response to what I've read here about the ending...
You are all neglecting one important thing. The victims were incapacitated prior to being sculpted with a knife. The prostitute was knocked out with a pipe, then carved into. The police officer was shot in the head, before his partner cut him open. These are the facts. How did the female general practitioner slice perfectly into that adult male? Outside of an operating room, would anyone just lay down and allow that to happen? No, of course not. There would have been a violent, bloody struggle, but we saw no evidence of one taking place. That male victim did not have the multiple stab wounds typically found when there is an assailent armed with a sharp piercing object. So, along with the previous trend, we must conclude that he was first incapacitated and then dissected afterwards. Working in a Hospital, the GP could have obtained any number of relevant substances and delivery tools.
We only briefly witnessed the second crime scene, and I'm not sure what we can conclude. Goose down feathers? Did the teacher suffocate his wife with a pillow, and then carve her open?
You all believe that the waitress murders someone seconds after the film ends. Given what we have seen, that probably did not happen. Not once was Mamiya/Mesmer present during any of the murders. All the while, Kenichi Takabe patiently waits for his car as the waitress he just "hypnotized" murders someone at the same time? I don't think so. More likely, the waitress retrieved a knife for the kitchen staff. Further, Kenichi Takabe "hypnotizes" a nurse to murder his wife? How are you even certain she is dead, remember when she hanged herself? Oh wait, that didn't actually happen. There was plenty of disturbing imagery, Makoto Sakuma was delusional before his suicide and we saw some of his visions too. Get a grip people, the film ended on a positive note. The case was closed, and the detective was probably promoted.