Based on everything I've read, I have to say that Eternum is undoubtedly a masterpiece. It was actually the very first AVN I ever read, and I can say with certainty that its high quality is definitely one of the reasons I kept reading AVNs.
The story is very well crafted, the music is often composed specifically for the game, which makes it more unique compared to other tracks you might find in various AVNs, and all the characters have their place and truly have their own distinct qualities that set them apart. Honestly, even though I plan to keep consuming plenty of AVNs, I don’t think anything will be able to knock this one out of my top 3.
To round out my top 3, I think Ripples is exactly what’s needed. I find the story truly original, and the work itself is very polished. I really love the fact that, within the context of the story, the author can incorporate plot elements that might be a bit confusing at first but ultimately make sense.
I also have to mention Christmas Eve and New Year’s Day(e) by Jonesy (they’re part of the same storyline). Like Cosy Cafe, it’s a linear story, and I really love the writing style. The plot is simpler, yet this AVN is the one that really hit me the hardest. No spoilers, but I can say it took me three days to get over one element of the plot.
An AVN I haven’t touched in a long time but found original as well is The Headmaster. It’s really a mix between an AVN and a management game, and it’s truly the most complete and well-developed game of its kind that I’ve played.
There are plenty of others, but the best I can do is recommend the Lewdflix website (https://lewdflix.com). As the name suggests, it’s a “Netflix for AVNs.” There are over 200 completed games and even more currently in development or even in early access. You can search by theme or by name; it’s truly the most complete platform. By logging in, you can play the games directly on the site. Personally, I prefer to use the site as a catalog and then download the games that interest me from itch.io or f95zone.