The older sister who lives alone in the city leads a luxurious life, and the older sister is a mistress who sells her body. At this time, the younger brother and his friends come to Tokyo from the countryside. They want the sexy older sister, and then they are discovered. The uncle has sex with them in front of them. The older sister was having sex wildly, allowing them to see their sensitive older sister, their intolerable younger brother and their friends, forcing them to have physical relations with the older sister.