And I think that's exactly what makes Eternum unlike other games on this site.
Not Just a Porn Game
It's not just a porn game, it's a very wholesome and sweet slow-burn romance with multiple beautifully rendered, unique and lovable characters with diverse, different personalities, and the characters they feel like they are real people, just like any anime or other media form. It takes the fantasy of a harem romance and it elevates it to this higher level of art, all with visual and aesthetic beauty and wholesome/sweet/romantic slice of life vibes. It feels more like a western anime/manga with fanservice.
Not Just Romance
But it's not just romance, it also has slice of life, worldbuilding, lore, a conventional blockbuster story with mini-stories (inspired by Witcher 3, Avengers, Blade Runner, Cyberpunk, Ready Player One, Doki Doki Literature Club, Horror, and so on), and also adventure elements, and it has the freedom to explore this diversity using the servers/main setup of the game. The gameplay is extremely simple but the core idea of a corporation with this MMORPG allow for a very complex and diverse story with a lot of variety.
For these reasons, I seriously doubt any game will be able to top Eternum in the future, but I will keep an open mind.