After a serious traffic accident, Yukie faces a large settlement demand from Taketo, the son of Nogawa Industries' president. With no means to pay, she agrees to a compromising arrangement that draws her step-daughter Rumi into Nogawa's sights through blackmail. His schemes gradually extend to include Yukie's younger step-sister Tomoko. The sincere older sister and the curious younger one find their lives upended by these powerful men's influence, leading them toward an inescapable fate.