No fantasy stuff like elfs, dwarfs, demons etc. Mutants of different types mainly. Accelerated evolution's due to high radiation sort of thing. Can't really explain better without spoilers.
I read that the MC here is quite naive? How so?
I can handle some naive MC like lacking common sense or something ... but i hope the MC won't be like the Shy, Stuttering, Timid, Nervous, Indecisive kind of character. I can't handle those!!
