At a certain school, an ancient dark ritual thought to have been abandoned continues courtesy of the Rinkan Club (literally Gang Rape Club). In order to appease an angry goddess's wrath, women are chosen and gang raped—but there's more! One of the men participating in the gang rape must be related to the sacrifice! Furthermore, either the sacrifice must end up pregnant, or, should she fail to conceive, she must be completely covered in cum and sent down the river.