For my father-in-law's 3rd memorial service, I went back to the countryside with my wife, where my mother-in-law lives, during the Obon holiday. My mother-in-law, Natsuko-san, is always kind and exposes her plump breasts so carelessly that I couldn't stop my heart from pounding every time I visited. Even though I tried to relieve my sexual desire, my wife wouldn't respond to me, and I welcomed the day of the memorial service feeling frustrated. And then, as I was encouraged, I drank alcohol and fell asleep in a state of maximum sexual desire. And then, when I suddenly woke up, I mistook Natsuko-san, who was in front of me, for my wife and attacked her...