Keeping this not too long, informative, and without spoilers, here's what I have to say about Eternum:
It's a very well written game. It balances plot and fan-service evenly, without compromises, and without sacrificing the quality of either. The lewd scenes are well made, with smooth animations and fitting music choices. The characters, however, are the main draw of this game. The girls aren't written like "means to an end" or "faceless bodies" for the protagonist. They have full personalities and are written with enough detail that you could imagine them as real people. Perhaps the most significant example of a well written character in this game though, is the protagonist, Orion Richards himself. To avoid giving away too much, all I'll say is that Orion Richards is unique among visual novel protagonists, in the sense that he has a full personality, morals, interests, and goals with what he does. He isn't just a vessel for the player like most visual novel protagonists are. What I really like about him though, is that he isn't an invincible, perfect leading man either. He has a character arc, and he has flaws he has to overcome and improve from, and he has lessons he learns throughout the game. He's perhaps the most well handled part of Eternum.
That's all I'll say for now. If you wanna know more, download Eternum. I've been a fan of it since March 30, 2024, and it's become one of my favorite games of all time. It's an experience you won't forget. It's the kind of thing that you only see once in a lifetime.
Okay I see the door...