The elder sister, Ten, is 173cm tall, while her two younger brothers, Fuuta and Yojiro, are shorter than her. Ten, who has returned home for the first time in two years, treats his small and cute brothers like children, but the brothers have always loved Ten, and would secretly masturbate with their sister's underwear. One night, the three of them sleep side-by-side for the first time in a long time, and the short brother's long-held lust explodes, as they compete for Ten's blessed body in a sandwiched sex session!