Rin, a married woman, takes in her father-in-law, who has been living alone since his wife died, and they come to live with him. Her father-in-law's desire for Rin's fresh body exceeds its limits and attacks Rin! Although she resists, Rin's body reacts sensitively to the relentless torture of her energetic stepfather, and she ends up climaxing over and over again...