Rasen Sokou no Dystopia

The fate of the world rests in the vaginas of three “cores,” who conveniently happen to be school girls and the so called “vessels ” is out there to devour the virgin “cores”. If these “cores” are fucked, the world will be destroyed. One of the girls fell in love to her classmate who always saves her and she wants to surrender her virginity to him rather than to the “vessels”.