Kind homemaker sister Yui and easily swayed younger sister Karin lived comfortably with their wealthy stepfather after their mother’s remarriage. But when their mother was hospitalized, their nightmare began… The once-gentle stepfather revealed his lust, manipulating the submissive Karin into sex while forcibly impregnating strong-willed Yui. Soon both competed to serve him: ‘Our only worth is becoming his breeding bags—me first!’ Their minds fully brainwashed…