To make the relationship between family members closer and more intimate, the beautiful Shibuya sisters visited their older sister and lascivious brother-in-law. As soon as they entered the house, the gestures on the brother-in-law's face revealed the dark intentions hidden within him. Waiting for the right moment, he immediately took action and successfully achieved his goal when only the younger sister and him were at home. He pinned her down and used all his strength to rape her, satisfying his own animalistic desires while the poor younger sister screamed and struggled in distress.