A trio consisting of a pair of beautiful sisters and a boy, bound by a strong bond since childhood. As discrepancies arise in their feelings for each other, a terrible nightmare begins! The younger sister, あいは, confesses her love to 睦人, and pure love seems to have been realized. However, 睦人 has been pining for his older sister, ほのか. The three of them become entangled in a twisted triangular relationship as they each try to obtain what they desire from one another…
