Determined to prevent his cousin Reina from inheriting the family mansion, Hikimori attempts to drive out his relatives by blackmailing his voluptuous aunt, Shiho, with compromising photos. However, the tables turn when Shiho discovers Hikimori's secret spending habits, leading to a tense power struggle. Ultimately, Hikimori uses his leverage to force the widow into a series of erotic encounters, asserting his dominance over her.