In front of Mochizuki, a normal high schooler, appears a wounded girl named Mayuki. Mochizuki takes her to his home and finds out that he has gotten himself involved with a war that goes far beyond any human comprehension. One after another, Mochizuki and Mayuki confront girls that bear an unfortunate destiny, to fight to the death. Mayuki and Mochizuki are left with no option left but to fight...