While my wife was hospitalized for childbirth, my mother-in-law came from Isesaki in Gunma Prefecture to help with the housework. For a while, it's just the two of us, a forty-something mother-in-law and her son-in-law. The kind mother-in-law makes the son-in-law unable to suppress his lewd and perverted feelings!! Gradually, they start to see each other as man and woman. They end up in a secret adulterous relationship hidden from the family!!
