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Gravure idol Reiko was secretly dating her manager Eiji, and her work was going well. However, Reiko had a serious secret: she was satisfying the sexual needs of her reclusive brother Yukio. One day, Reiko made Eiji listen to an audio recording of her relationship with Yukio. After that, she was fired from her job, and her life fell apart. The twisted daily life of a scumbag brother and sister, the sister squeezing her brother's cock in her vagina, the incestuous relationship approved by their father, how long will this daily life continue...?