"The Manster"

What a strange Japanese movie.  The Americans in the movie carry most of the heavy parts and they were probably enlisted to give the movie some kind of gravitas.  An American reporter interviews a reclusive Japanese scientist who is trying to create some kind of new species.  Why--no one knows.  His latest experiment was a failure and he drugs the reporter and injects him with a serum that slowly changes him into a monster/manster.  Strangely enough, he grows another head and finally splits into two people.  So...it was the evil part of him that did these terrible crimes of killing people.  Is the unevil part of him then innocent.  His wife admits that he is guilty of something.  The movie ends with a ponderous question.  Worth seeing?  Well, maybe.  The viewer does sympathize with this poor reporter who turns very evil in the process of growing this other person.