The screen goes black. Audio only.
The “1” suggests this is the first installment in a series. It could be a visual novel, webcomic, or amateur drama CD. In English fan-translation circles, “Granddaughter” often replaces the honorific -musume no musume (娘の娘).
As a visual novel or digital manga, the core appeal lies in the artwork. This release maintains the original high-resolution assets while integrating the English text overlays more cleanly, preventing the "text-bleed" that often obscures background art in lower-quality patches.