On the surface, her relationship with her boyfriend appears to be an ordinary romance. But his true nature is something entirely different. He is far more consumed by sexual desire than Sachiko ever imagined, and his real self is beyond what one could guess from his appearance. His demands gradually grow more intense, leading her into realms far beyond mere sex. At first hesitant, Sachiko slowly begins to comply, her own consciousness pulled along and transformed by his escalating desires. The way she's drawn into his lewdness makes it feel as if she's losing control of herself completely.