Oh, my name is Hiroshi. - I've been dating my girlfriend for half a year. - Her mother, Chisato, is a kind, beautiful, hardworking, and calm adult woman who raised her daughter by herself as a single mother. - But in reality, without telling her, I have also had sex with her mother... - Chisato and I both think that this type of relationship is not good, but we can't stop each other from being horny and having a desire to reproduce.