Yuusei, the son of the highly acclaimed actress Hirano Kyoko, who is recognized for both her popularity and talent. His father passed away early, leaving Yuusei to live with the beautiful Kyoko. For Yuusei, his mother was the ideal woman. His strong feelings led him to engage in self-gratification while watching Kyoko on TV. This situation was observed by Mayumi, Kyoko's sister and Yuusei's aunt. To fulfill Yuusei's twisted desires, Mayumi disguised herself as Kyoko and began to serve as Yuusei's "mom," engaging in sexual acts. However, in Yuusei's mind, there was only his mother, Kyoko.
