I don't understand this game. The only real things it has going on for it are the Fate universe, visuals and decent story.
It's a very long, not really interesting and tedious VN. Don't expect any early porn here btw, because the only scenes that are there, you get to see after whopping 40+ hours minimum, and you have to choose a single heroine with 3-4 scenes. It really has that feel like they made the game and thought that it could use some porn in it, so they just crammed all of it at the end before the end fight.
The story is decent, but the writing is not great. It feels really forced. Example - you have 5 people in a room, you ask one person a question, they answer, but for whatever reason, eeeeevery single person in there has to answer as well or add to it, even though it has zero to do with them. They always interject with zero value remarks and sentences. Also every character has to interact in rotation, like one character says a sentence, then next character, then next, so everybody says something... and the rotation just keeps going. It's awkward, robotic. It's like in a kindergarten where the kids sit in a circle and they answer the teacher's questions in order.
Gameplay is just boring. I don't like VNs, but I would rather not have combat at all here. The combat is incredibly boring compared to FGO's. The combo's don't make much sense, they don't work well together, nor are tailored for the characters strengths (except for some OP skill+card spam). It's really slow, the animations can be really awkward and slow when some characters take 5+ seconds to make a single move (why do you need some characters to stand there for 2s before a trigger forces them to neutral position?) it takes way too long to finish the fight (enemies have way too much HP and if you lose you know it's gonna take another 10 minutes of fighting to get to the part where you died) and the locations are filled with trash enemies that have no reason to be there except for being an annoyance and gametime stretch (you can kill them in seconds, but you have to wait for the fight to start etc.). Map locations I get, though there are intermissions that have no purpose but for you to just spam "next" and "confirm", like getting out of your house to your car and drive to school (which happens every single day).
Story is good. Decent characters that feel unique and with personality.
Audio is also good (though it's mostly lightly edited OG audio from the sources).
Visuals are fantastic. Really high quality.
All and all, if you like Fate and VNs and you are willing to power through the annoying combat (also, some bosses are just stupid hard in terms that you just have to do specific things in specific order to win), you might enjoy this for the story. But don't expect a good nsfw content and/or gameplay.