Her name is Esumi Fuuka. Standing tall at 163 cm with a slender bodyline, she must be a university undergraduate; however, in reality, she is only an elementary school student. With a body figure of an adult and the mentality of a small child, she creates many misunderstandings around her.

Yusuke, an orphan, literally has Rouge, the amnesiac oldest daughter of the Underworld's deposed royal family, fall out of the sky into his lap. She is soon followed by her two younger sisters and also their family's enemies. Rouge must decide if she wants her memory to return, while Yusuke must deal with the upheavals in his life the princesses have caused.

She is a happy housewife, but she once lived on the edge. It was a dark chapter in her life. She has worked hard to forget her dark past, though her mind and body will not allow her to do so completely. She had done a good job of controlling herself - until one day when her husband brought a friend over to the house, and that particular friend happend to be someone that she had had a fling with during her wilder, darker days. The lust that was caged for so long has now broken free... There is nothing holding her back now!