I'm a 2nd time college entrance exam retaker and I'm staying with my brother and his wife so I can concentrate on my studies, but I can't help but be drawn to my sister-in-law, Haru. Because I'm always studying and don't have a girlfriend, my sister-in-law's big breasts are very stimulating... I've been having a hard time concentrating on my studies because of my frustrating life. One day, when I was about to take a bath, I found Haru had gotten hot from a long bath! ? . I looked after Haru who had fainted, but her body was too stimulating for me as a virgin... ? ?