There won't be an evil route, but if by joining the monster girls' team you mean more fully committing to the full monster girl-ification of the world and throwing out the doubts Maia has about it, then I think you'll like the direction this takes...
Sorry for the late reply, it appears I forgot to make the link not expire (dunno why it's not like that by default), I've updated the link and it should work now.
