A fleeting, obscene memory that is stuck in my mind and won't go away... By the time I was old enough to understand, my father had disappeared, and my mother had passed away due to overwork, so I was left in the care of my aunt, Izumi. However, I was shocked by my life with Izumi. The magnificent large breasts that had grown on her chest, and the naked body of an adult woman that I saw for the first time in a mixed bath. I couldn't suppress my sexual interest in Izumi, and I gave in to my desire and desired her...