Erika, a cabaret girl, and Airi, a college student, are sisters by bond, not by blood. They share a deep, intimate connection—a relationship far beyond mere sisterhood. One day, Erika is involved in an accident. Though she survives, she falls into a coma. During her unconsciousness, Airi begins a relationship with Serina, Erika’s junior who has long admired her. Three years later, Erika finally awakens—but with no memory of her past. To help her recover, a beautiful and skilled therapist named Aoi, specializing in memory disorders, enters their lives. As fingers entwine, lips meet, and bodies crave one another, jealousy and desire intertwine among the four women, giving rise to new emotions. Their secret-laden relationships are about to be reconstructed in an entirely new form.