Des:Amu is a high school student who came to Tokyo to take an entrance exam in Tokyo. Her host is the Kawasaki family, a relative of Amu. The ``Kawasaki family has a son named ``Shintaro who is a ronin student, but he does not study every day and only masturbates in front of the computer, leading an unproductive life. Meanwhile, ``Amu and ``Shintaro meet again for the first time in a while, but ``Shintaro notices that his girlfriends cousins breasts are ridiculous. Shintaro, who remembers how they used to often take baths and sleep together, cant help but want to see Amus breasts.