Valkyries are Virgin Warriors of the Norse god, Odin and they protect the humans from s of the outer skirts. Yet the s have found their weakness after the goddess, Freya's betrayal to be a sex slave. Thus one Valkyrie was made a sex slave after being threatened that her other kinsmen will also share the same fate if she does not submit. With the castle taken over, the s challenged all men to impregnate her, if they wish to live...