The premise is cute enough but I feel it would have worked better as a short-form anime. As a 24-minute show, the single joke repeated over and over felt a bit dragging on. I think 12 minutes would be perfect for this.

Largely cute and funny, but with a couple big problems. Firstly, it looks like the manga it's based on has very short (4 page) chapters, and the adaptation didn't really do anything to pull them together into a narrative but just adapted them back to back, giving the show a distinctly 4-koma feel (derogatory). Secondly, the show is constantly and unnecessarily horny, especially leaning on incest jokes, which are really uncomfortable.

It has potential, but as it is I give it 3/5

Predictable stories out of a premise like this:

Everyone amazed at how this suddenly happened, of course. A lot of standard shocked reaction shots.

Grandpa oddly gets all the attention for turning into his hot young self.

Maybe a bit of wish fulfillment for the likely male(?) author. I can't determine the gender from the mangaka's name: Araido Kagiri

Have you ever looked back at your parents' photos of when they were younger? Your grandparents?

It's hard to think of these close relatives as young attractive humans, because we only really get to know them as their older selves.

I wouldn't condemn the mangaka of writing incest.

I think that Japan's Shinto/animist culture gives their manga/anime's ability to express what Freud would call the Id is what makes it feel liberating to dominant monotheistic-religion-based cultures.

If granddaughter thinks young grandpa is cute, that's perfectly understandable. Her own genetics should make her attracted to the things that made grandpa sexually attractive and obviously reproductively successful.

But that's also socially awkward comedy gold.

Anyway, this looks like it'll be good, if it doesn't get too repetitive.

Just skimming the source manga on Pixiv I believe the anime writers are adding a lot of their own stories already in this 1st episode.

@rikka@ani.social

That OP though...oof. Honestly will be the worst out of any of the shows I'm watching this season. And the show itself really doesn't lend itself to a very long run, so I'll probably end up dropping after next episode.