Brother Ryuta is somewhat of a shut-in, having established a sexual relationship with his younger sister, Nenne, a female student. Nenne knew it was wrong, but she couldn't bring herself to reject the kind Ryuta. They haven't engaged in penetrative sex for years, but they continue with oral sex. One day, Kameda, a friend from Ryuta's student days, visits. Kameda fixates on Nenne's large breasts, using Ryuta's relationship as blackmail material, plotting to entrap Nenne...
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