Grandma has previously enjoyed intercourse with her grandson, guiding him to lose his virginity using her skilled techniques. Drawing on this experience, she now sets her sights on another grandson, Mamoru, taking it upon herself to personally initiate him into manhood using her own body. Throughout the process, she discovers new emotions and pleasures, gently and meticulously guiding him with warmth and care. Her tender yet passionate presence becomes the foundation for Mamoru's transformation.