When his mother dies and his father remarries, Kaito notices the brilliance of his sexy new stepmother, Sayoko. Mad with lust, Kaito begins to spy on her and sneaks into her bedroom. Although broken with guilt, Sayoko eventually finds herself a willing participant. And when Kaito tells her that his father is cheating on her with a young woman, theirs becomes a full-blown affair.Sex, sin, and betrayal get the whole Kaito house upside down!