Closest would be "Out of Touch". "Dissonance" is the least bad among the LiL lookalikes, but I personally don't recommend it - just letting you know it exists, alongside "Lost in You".
Stepping a bit away from LiL, if you want the school mystery thing, "Crimson High" is fine, but not that good either. If you simply want something with a story, no matter what it is, then there's "The Fiery Scion" and "Secret Island", those two are heavily D&D based. "Cosy Cafe" is a very soft submissive harem school one. All of these are ongoing games however.
Going into completed games: "Always Fan" and "Parental Love" are plots without supernatural elements. "Now and Then", "City of Broken Dreamers" and "Mist" step more into the fictional aspect of the universe, be it supernatural or technological. "Long live the Princess" is D&D like.
"Last Sovereign" is just amazing (expansive detailed universe, 100+ gameplay, great comedy, decisions affecting a lot), Sierra is a great author of other games as well. However it is rpgm-based, unlike everything mentioned before, and I recommend using a guide for playing it. Lastly, I just think "Boat" is incredible, but that's because I'm a big fan of time-loops and multiple endings. And while it is an amazing game, it is also not for everyone (best definition is "a meme that grew into something serious").
There are tons of games in my recommendation list (on my signature), you can check it out if you want as well (total is almost at 300 games).