​In this thrilling episode of lustful desires, meet Hirose Anna, a seductive 23-year-old who takes charge when she discovers her little brother’s secret fetish. Determined to keep him satisfied, Anna fearlessly unveils her naughty side, progressively escalating her actions each time. As their intimate bond deepens, she boldly confesses to becoming his older sister who will fulfill his carnal desires, with the exception of vaginal intercourse. Throughout their taboo encounters, Anna remains true to her promise, passionately indulging in his filthiest requests while valiantly shouldering the responsibility of their forbidden relationship. Brace yourself for an alluring tale of unchecked cravings and familial surrender.​