A high school student named 'Rihō' came to Tokyo for an exam and stayed with her relative, the 'Kimura' family. The 'Kimura' family has a son named 'Ichirō,' a delinquent who spends his days jerking off instead of studying, showing no signs of improving his academic performance. After about 10 years, 'Rihō' and 'Ichirō' reunite... She had grown enormous breasts in the time they hadn't seen each other. Remembering how they used to bathe together and sleep together, 'Ichirō' stares intensely at 'Rihō's' chest.
