姐姐千佳擔心自己不成熟的弟弟，因為他性知識不足。一次家庭聚餐時，弟弟講述了前一天晚上他目睹父母性愛的情景，令氣氛尷尬不已。千佳覺得有責任教導弟弟性知識，於是決定用自己的身體來向他解釋女性的身體構造。從如何正確佩戴避孕套到性交…
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