At my usual bookstore, the store owner wasn’t there—instead, I found his granddaughter, Kotone, attending the store. A stunning beauty with glasses and exuding a mature charm... She is the older sister figure I had admired since childhood. But what if Kotone turned out to be incredibly lewd…!? A reserved erotic novel she had set aside reveals an unexpected side of her... The flood of filthy words coming out of her mouth, in complete contrast from her usual demeanor, sends my excitement through the roof!!