The Jabami family belongs to the Momobami clan. Their family business is gambling. The older sister, Souko, and the younger sister, Yumeko, lost their parents at a young age and spent their days under the care of their aunt, Tsugiko, as if they were in a languid slumber. However, their peace is shattered... by the blood of the gambling-obsessed Jabami. This is the 17th volume of the story about the academy gambling tales of beautiful girls, delving into the past of the Jabami family.