Kimika is a cheerful and frank person who is not afraid to talk dirty, and is very popular with her son's friends as a mother they can talk to about anything. Her son's friends always gather at the Ichijo household, drawn by Kimika's beauty and dirty talk, and enjoy silly conversations. As the usual dirty talk progresses, Kimika decides to hold a game to guess her son's penis. To her sons, it was just a prank, but Kimika's expression changes when she sees the magnificent view of a row of penises, her favorite food...