An incest sex movie about Yuuka Mizuno, who has been remarried for a few years and is living happily with her new partner. There is only one problem… she is still having sex with her own son! This illicit relationship started long before Yuka remarried. She thought that remarriage would be a chance to end this relationship, but it is clear that Yuka cannot refuse her son. She also realizes how much she loves her son. And when her husband goes on a business trip for about three days, the two of them throw everything away, jump into each other, and enjoy this short private happy life…