It has many great shoots, and smooth art. The story isn't half bad but it feels blank, I guess its just not for my weebish preferences, where every waifu must end up on her knees, and main character must fight demon lord in second chapter.
Putting grandpa as a main character feels awful, e.g the idea of 1000 year old loli is cool, but a grandma that just looks like loli is disgusting. Nothing serious tho, so chill. I try to dodge manga when I know mc is 70 yo, but this one just felt nice, and there was a really little about mc, since story focused mainly on past of other characters, so its not really casual. Story may give you few things to think about, unlike other isekais where it can make you pull your pp out.