First I want to clarify that I enjoy playing grindy games if they have something that pays off, I know what I can expect when an entittled dev puts a warning message, but I also expect that with that entittlement also comes some show of talent, or something to show for.
This game is not grindy cause most of the scenes are pointless, dont achieve nothing, dont give you points, dont progress character development, dont give any visual candy, so you dont achieve a single thing, most of the scenes are filler, the characters will not remember that they kissed passionatele in the kitchen once, cause in the next scene one of them is gonna scream at you for putting your hand in her shoulder, which happens cause the expert in grindy games still can't make a game withhout an absolute broken logic, or maybe he doesnt want to.
There are even recycled events from one chapter to the next that dont progress any further. I dont know if I whould call this ill intentioned or lazy as fuck, but that is not the definition of grindy.
The girls are all 40 year old nuns, they are absolutely passive/curious trope until the dev decides they are not anymore. They react to the same types of stimulation in the same ways (cause the limit is established by the episode) they prety much react to invasions of privacy the same way, and there is even a pool of words and expressions they use, and I could write down, but I dont think the developer cares about criticism.
The most funny is the use of "We are siblings" or "We are not siblings" as attack or defense, that is the only human trait the characters have.
Visually the game is predictable, cause lets be honest, all the girls look pretty much the same, the same type of body, the same size and type and color of nipples, the same small butt, the same flat belly, the same pussy, so there are not much you can enjoy after seeing the same thing 200 times.
And this happens cause "Photography" for the first 8 or 10 hours of the game is a core element, and the most visual candy you will get will be pinups, and of course later in their rooms they wont remember that they were posing topless and will shout at you cause they were showing a nipple slightly.
If you add something in every episode that puts this slugfest to a halt for 1/3rd of the episode, you get something that even I cant take. Anyway TLDR:
The BAD
Playing this game is diminishing returns for 20 hours
Repetitive and pointless filler events.
Predictable in every step of the way scene design.
Characters are flat and look the same.
Main characters are walking memes.
Short low effort scenes with very predictable outcomes.
The conective tissue is very thin and weak.
The GOOD
Visually pleasing.
I like the stats screen
Pinups are decent (But dont expect sports illustrated or playboy)