A documentary-style work following actress Ryo, an anal enthusiast, on her four-day journey toward becoming an anal fist enthusiast. In part 2, on the fourth day, she attempts to insert an anal plug nearly ten centimeters wide at the base, a size that triggers stronger anal resistance, making the act of insertion feel more intense and real. The film ultimately depicts the complete progression, culminating in the insertion of a man's fist into her anus.