Board Thread:General Discussion/@comment-25826555-20160829230457/@comment-25826555-20160902235256

That's the thing, though.

Mamono only ever produce Female Mamono.

Assuming that every female is mosterized within two hundred years, that means that the human race is no longer capable of producing males (which, although there has been a mamono population boom, the newly-created mosnter girls cannot find husbands that are already taken.)

Even if the remaining males were to die off, they would either be resurrected as Undead or their wives would join them in the afterlife. It is hard to define Undead folk as technichally even 'human', regardless of gender, seeing as they no longer meet all of the requirements to be considered living and categorized as a member of Homo Sapiens Sapiens.

Eventually, the male population runs out. Mamono population increases drastically. Humans die out entirely, and shortly afterwards, Mamono die out as well without a source of spirit energy or reproduction.