You know how in fantasy worlds, its all english? Kinda breaks the immersion a bit. I wanna find something where they make it as realistic as possible, and make everything in a fictional language, basically using subtitles as the main way to understand the plot.
The Expression Amrilato is a VN that’s mostly in Juliamo (i.e. Esperanto with some modifications like a custom alphabet). It’s mostly an Esperanto tutorial though with an isekai yuri plot.
Disney’s Atlantis had a custom conlang specifically made for it, but IIRC the dialogue was mostly in English still.
That’s the most espirantist thing I’ve ever heard