This might be my favourite AVN story-wise, I'm a big fan of similar games with fantasy setting and The Seven Realms potentially have the richest and the most interesting story I've seen so far.
Visually, the later stage of the game looks amazing, lighting is just on another level compared to First Realm, same with animations and ability to change angles as you want. Difference between the First and Second Realms is very noticeable but early graphics and animations also doesn't disappoint.
Characters are written quite well, their personalities are distinct and design looks really good and quite unique.
Story, as I mentioned, is very interesting and exciting, intrigues and betrayals, difficult decisions, plot twists and mysteries that are left to solve in future updates, everything is on point and doesn't leave player bored for sure, at least it was like that for me.
It might be less important but UI in The Seven Realms looks really awesome and unique as well, I love their style. What I really like and respect about these developers is their professionalism if I may say so, their thoroughness, impressive progress and approach to developing. One of my favourite parts is their website that contains various information about whole game, characters and future teasers, really good job here.
And of course music, I can't express enough how much I love their music/ambient sound through whole game. Even if there aren't dozens of different melodies and sound effects, those that are present in game fits the overall mood and atmosphere perfectly, not a single time I thought that I'm getting bored of it. Especially Second Realm, music in Pythonium is legit the most memorable and one of my favourite soundtracks among all AVNs, shoutout to person who made it.
Overall, if you're looking for an AVN with rich and interesting story, solid writing, great music and amazing characters - you should definitely try this game and most likely you won't regret it.