Koharu is a sweet, innocent girl with kind eyes behind her glasses. With her gentle, warm personality and lovely girlish charm, she adores her older brother and always agrees to his requests with an angelic smile. One day, when her brother makes a shy, intimate request, she blushes but quietly nods, removing her clothes and offering her naked body to him. A pure love story unfolds between the bespectacled little sister and her brother, culminating in creampie-filled intimacy.