Living in Tokyo, I returned home for the holidays after a long time. My parents and grandfather live in my childhood home, with my grandmother having already passed away. My mother has been taking care of my grandfather, who fell into depression and is half bedridden. My father shows no interest in family life and is always out having fun. One day, I heard strange noises coming from my grandfather's room—clearly, a woman's voice. Curious, I quietly slid open the fusuma door and looked inside... only to see my mother moaning as my grandfather groped her breasts. Horrified and disturbed by the grotesque scene, I fled in confusion and fear.