Reiko was abandoned by the man she expected to marry just after becoming pregnant with her daughter Emi. Determined that single motherhood would never hold her child back, she worked tirelessly for twenty years. Now Emi has graduated, found a job, and seems headed toward marriage and a bright future. Then Reiko unexpectedly sleeps with her daughter's boyfriend. Despite loving her daughter, she can no longer suppress decades of pent-up desire, and electric pleasure races through her body as she convulses and arches beneath him.