Koumi-jima: The Females Who Can Give Birth Seven Days a Week

Based on the CG collection by Aomizuan, the story follows Seiichi, a schoolteacher with an insatiable appetite for traveling to remote islands and extraordinary sexual stamina. Despite his physical prowess, he remains deeply unsatisfied with his everyday life. His routine is abruptly upended when the chief of a familiar island requests his presence, leading to his transfer to a secluded location known as Koumi-jima, or Childbirth Island. For centuries, the women of Koumi-jima have thrived under unique customs centered entirely around their roles as females, evolving a remarkable biological constitution that shortens the span between conception and birth to a single week. However, generations of genetic isolation have pushed the island's population to a critical threshold where only outside genetics can ensure the survival of future newborns. Recognizing Seiichi's exceptional fertility and external lineage, the island chief presents him with a singular request: to impregnate every woman on the island. Embracing a culture rooted in absolute male superiority, the women find supreme pleasure in serving men and bearing children, setting the stage for Seiichi to fulfill their deepest instincts upon his arrival.