Shiori lives in her hometown in the countryside and spends her days without excitement. She is interested in erotic things and is tormented by information and videos on the internet. One day, her older sister and her husband come home for the first time in a long time, and the house is already bustling. That night, after a family meal, Shiori sees her drunk sister's husband's penis. She is shocked by its impressive size even though it is not erect. After that, Shiori's head is filled with thoughts of her brother-in-law's penis, and she finally sneaks into the room where her older sister and her husband are sleeping.