It's yet another anime about Cute Girls Doing Cute Things, which here is geology and astronomy. They're schoolgirls at an earth sciences club. This is pleasant, but there's little point in watching them. It's twelve episodes of "nice", with a bit of science on the side and almost no drama. I only reached the end because I'm bloody-minded and because I was going to write this review. As soon as I've finished writing, I'll ditch the episodes.
It's based on a four-panel manga series from Manga Time Kirara Carat. In fairness, some very good anime have been adapted from four-panel manga. This is not one of those.
DRAMA = ahahaha, no. There's an occasional tiny sprinkling here and there, but the show has no intention of letting it mean anything.
LESBIAN SUBTEXT = well, yes. It's Manga Time Kirara Carat. That said, though, most of the clues are extremely subtle (since the fanbase are industrious and hyper-sensitive in looking out for them) and a casual viewer would probably at best notice that Mira and Ao are extremely devoted long-term friends who move in with each other. It's just subtext, available if you're looking for it.
Well, except for Suzu. She could hardly be more loud and explicit.
SCIENCE = this can sometimes be interesting. For instance, some of Japan's hot springs are acidic, with at their fiercest a pH of 1.2. That's almost gastric acid. There are situations where fossils can form in weeks, not just millions of years. I'm charmed by the girls' passion for their chosen disciplines and I'm happy to support their activities.
CHARACTERS = they're nice and they don't lack that much definition, despite the largely drama-free context. They all look the same, though. You'd never be able to tell them all apart if it weren't for their unnatural hair colours.
CRUNCHYROLL SUBTITLE FLUBS = ep.10 contains a gem, inviting you to misread "moon" as a verb. (In the original Japanese, though, there's no innuendo.)
"Observe the stars and moon, while eating delicious food."
The repeated use of "boring" in ep.6 is also unfortunate, albeit probably unavoidable. The girls are drilling holes in the ground. What else would you say?
It's not a horrible show. It's fine. If you watch it, you might find that you've fallen half-asleep a few times and missed bits, but it's never off-putting. I like the show's time span, for instance, which creates an odd kind of nostalgia in talking about previous episodes as "this time last year". It can be funny, e.g. Mira's "eh" after "you're dumber than Mira" in ep.5. However, I'm both perplexed by and hostile towards Japan's propensity to make anti-drama anime, even if such shows can sometimes turn out better than you'd think. "Cute girls do cute things", "overpowered isekai heroes"...