When Yuka became pregnant with Riko, the man she expected to marry suddenly disappeared. Determined not to let her daughter suffer because she had a single mother, Yuka spent the next ten years working tirelessly. Riko has now graduated from university, found a job, and appears headed toward marriage and a bright future. Then Yuka unexpectedly sleeps with her daughter's adult boyfriend. Despite loving her daughter, she can no longer restrain years of suppressed desire as electrifying pleasure races through her body and leaves her convulsing and arching uncontrollably.