One day, while Himawari was home alone, her uncle paid a visit. Seeing Himawari again after so long, he was struck by how mature and womanly she had become. Tempted by her innocent, carefree demeanor, he lost all self-control. To his shock, he soon discovered that Himawari's older sister, Kanon, had already been taken as well—setting the stage for an illicit family affair.