A series of erotic happenings occur due to a mystery hidden in the Asagi family. The protagonist, Uzuki Atsushi, was all alone in the world. One day, he is unexpectedly adopted by his distant relatives, the famous Asagi family, who are local celebrities. And so he suddenly begins living with the unique Asagi women: a gentle and beautiful mature woman who is a former actress, a flashy kuro-gyaru model, a healthy and beautiful athlete, and a mysterious idol little sister. Make them climax and uncover their secrets!