On the verge of marriage, sisters Ai (Shiori Kuraki) and Mari (Minori Kawanami) embark on a final sisterly trip together. However, their journey is far from a simple getaway—it becomes entangled in the dark grudge left behind by their father's past. Their father was a ruthless businessman obsessed solely with wealth, leaving countless victims in his wake. Those who refuse to forgive his sins have quietly prepared their revenge, setting their sights on the sisters' trip. What follows is the long-awaited moment of retribution, leading to rape, lesbian coercion, and intense humiliation within the twisted bonds of captivity.