Incest mother-child favoritism

Tsuyako, a businesswoman, lives with her common-law husband Yasuo, who doesn't do much work, and their only son, Keita, a ronin student. Tsuyako's ex-husband was also a man no different from Yasuo, and Keita had evaporated when he was a child. Tsuyako's lust and strong nose inevitably lead to her lack of luck with men. Eventually, Tsuyako says goodbye to Yasuo and immediately welcomes a new man. Feeling sorry for his mother, Yasuo makes a decision. "Mom, I'll take the place of those men..."