Shouhei’s life takes a surprising turn when his dad marries Rino, a GAL-style classmate, now his step-sister. One day, curiosity gets the better of him, and he discovers Rino sleeping naked. Unable to resist, he explores her soft breasts and belly, becoming captivated by her alluring buttocks. This sparks intimate encounters between them, creating an irresistible attraction. Later, Rino wears a nurse outfit to fulfill Shohei’s fantasy. As they live together, their secret love deepens, and they find comfort and excitement in each other’s arms. They embrace their desires, embarking on a thrilling journey of love and intimate connection.