My stepfather's wife is teasing me about my stepfather. Please forgive me now...

Erika's wife is living with her husband Keiichi's father, Toshio, in order to save up a down payment for her home. Keiichi's premonition has come to light when his father, who has always had a bad habit of being a genius and a fan of sex industry, was worried that he would try on Erika. Toshio, who is lustful by Erika's glamorous body, forcefully pushes Erika down and rapes her. He could never say, "I was raped by your father"... Erika's heart guilty towards her husband was bulging out...