So... basically their appearance change an health and all but they can't deny that they are still old people. I'm guessing the hourglass is for them to enjoy their "youth" before they leave...?
Oh...
And here I thought I'd get a good chunk of sweetness. Oh well, time to drop I guess....hmu in the comments if something good happens in the future. Thanks!
@Lxminous i have been around the author pixiv about the raw
the grandpa will be turn back to youth again in the future also his power and stamina is still the same even his older looks (so still strong like whe he young)