In this new drama series brought to you by Sexy Gal Housewives, Mami Nagase takes on the challenge of portraying an unfaithful wife! After moving to Tokyo to attend college, Yuuta finds himself staying at his brother's house due to a water outage at his own apartment. As Yuuta begins living under the same roof as his beautiful sister-in-law Mami, she can't help but be drawn to him. Slowly but surely, Mami starts seducing her young nephew, leading them down a path of infidelity that knows no bounds! Her voluptuous figure and alluring charm drive both of them wild as they engage in passionate extramarital intercourse.