Sumire, the second wife of Koichi Kanazaki (Rich Dad), lives a wealthy and happy life, but worries about her relationship with her son-in-law Takashi and her nightlife with her husband. On the other hand, Takashi lived in agony every day with his young and beautiful mother-in-law Sumire. One day, Shigeo Yamamoto (Poor Dad), a regular employee of Koichi's company, finds a gap in her heart and embraces her, drowning in the technique. Takashi is also seen through his own inferiority and falls in love with Shigeo's "philosophy of sex". After that, Sumire and Takashi began to have a physical relationship.
