Lala, a cheerful and lively high school girl, absolutely loves spending time with her older brother. One day, when she enters his room to play, she catches him masturbating! "Hey, big brother, can I watch you finish?" she innocently asks. Her innocent request tempts the perverted brother into making her help him masturbate. Completely captivated by Lala's pure demeanor, her brother gives in to increasingly lewd desires. This scenario vividly contrasts Lala's innocent nature with her brother's depraved side, creating an irresistibly captivating experience for viewers.