Miyuki and her older sister Harumi and her husband gather at her parents' house for the third anniversary of their mother's death. Miyuki's husband is coming later, so Miyuki is relaxing alone at her parents' house. Harumi's husband Ippei is watching her with lustful eyes. Her panty lines are visible under her skirt, and her defenseless appearance after a bath... Unable to control his reason, Ippei devours the sleeping Miyuki. After her husband joins them and the whole family is gathered, Ippei continues to perform obscene acts on her, and Miyuki's body gradually begins to feel pleasure...