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Kyoko (Shiratori) who lost her parents and lived with her older brother, Yuki. Courage developed Kyoko's anal so that children could not be made between brothers and sisters. A perverted brother and sister who deepen their love through anal. One day, the engagement of courage is decided suddenly. Kyoko also gets engaged to another man out of revenge. However, Kyoko, who has already become unsatisfied if it is not her brother's body, proposes to cancel the engagement, but in return, what is proposed by her fiancé, Iei...