Kiyoka is a lesbian, but has a husband. Kiyoka is lusting after her husband's mother, Mika. Kiyoka was raised by her mother alone and loved her mother very much. However, the fact that she was a blood relative held her back and prevented her from taking the first step. Mika was just like her mother. One day, when her husband was going on a business trip, she invited Mika on a trip. In order to make her mother-in-law succumb to lesbian pleasure that very day...