I work in Tokyo, and I took advantage of my days off to return to my parents' house for the first time in a while. My parents and grandfather live there. My grandmother passed away, and my mother is caring for my grandfather, who is depressed and half-bedridden. My father has no interest in family life and is always out and about. One day, I heard a strange voice coming from my grandfather's room. It sounded like an exaggerated roar of a wild animal. Curious, I quietly opened the sliding screen door. There I was, my mother moaning as my grandfather devoured her breasts, while my grandfather lovingly played with his penis.