Lili-Men

Lili-Men (LILI-MEN リリーメン) is a Japanese manga series written and illustrated by Takuma Tokashiki.

Plot
The "succubus," a race that breeds on human beings as a nursery, and the human race, which seeks to eradicate the succubus. After a long time has passed since the two incompatible species began their struggle, a "king" is born who will end the war. The winner chosen by the king will be...!