Yuka has been remarried for a few years and is living happily with her new partner. The only problem is... She is still having sex with her own biological son! This abusive relationship began long before Yuka remarried. She thought that remarrying would be an opportunity to end the relationship, but it was clear that Yuka could not refuse her son. She also realized how much her love for her son was. And when the husband went on a business trip for about three days, the two immediately threw it all away, rushed into each other, and enjoyed this short private happy life...