Five years ago, I left my parents' home and moved to Tokyo, where I finally came home. My parents and grandfather lived there. My grandmother had passed away, and my grandfather was half bedridden with depression, and my mother was taking care of him. My father had no interest in family life and was always on the go. One day, I heard a strange sound coming from my grandfather's room, which sounded like exaggerated animal noises. Out of curiosity, I quietly opened the screen door...