'Ruka's' house, her uncle and his son 'Daichi' came to visit after several years. That night, the uncle invited Ruka and Daichi to take a bath together, only to be shocked. The body of the niece he thought was still a child had grown into that of an adult woman. Living in a father-son household with no wife and lacking female companionship for so long, the uncle couldn't control his lust after seeing Ruka naked...
