His father's new wife, Rika, is a beautiful woman with huge breasts that makes his son Noboru jealous! Although he is happy, Noboru is forced to live a life of frustration with the attractive Rika. In order to relieve his frustration, he decides to go to a soapland. He chooses "Rika" as recommended by the shop assistant. And it is his stepmother, "Rika". Noboru is stunned by the reality, but his dick is hard as a rock...