When she became pregnant with Mayu, the man she expected to marry vanished without a word. Determined that her daughter would never suffer because she had a single mother, she worked tirelessly for ten years. Mayu eventually graduates from university, finds a job, and seems headed for marriage and a bright future. Then the mother unexpectedly sleeps with her adult daughter's boyfriend, and years of suppressed desire erupt into electrifying pleasure she can no longer control.