Haruna leaves her hometown and heads to Tokyo to pursue her dream. However, her older brother strongly opposes her ambitions, driven by twisted feelings rooted in forbidden desire. To prevent Haruna from becoming an idol, he takes extreme measures—claiming her anal virginity to keep her as his own, turning his beloved sister into his personal possession. Rejecting the idea of other underworld men defiling her, he escalates the situation into a self-driven double penetration session. As the filming intensifies, his madness deepens, pushing his obsession with Haruna to its absolute limit.