A person before me posted the MC X System thread (where they argue, not have a romantic relationship) (Now I won't feel bad pushing their thread down) I want an MC X System novel where they HAVE a romantic relationship as well as an additional restriction of the system being an RPG system like in most isekai's. Well, there can be some differences but no Host-support system like in those CN josei novels, that makes it just a poor replica of "Her" (an awesome movie, 5/7 would watch again) Preferably no harem
Well. I think someone posted "Reborn as a System" in the previous post. That's the only fic I know that somewhat fits your requirements, I guess. Although MC is the system and ML is the host lol. And it's kinds of RPG-like. I think. It's been some time before I read it lol so I might not remember some things right. It's also BL, by the way so watch out for that.
Don’t Pick Up Boyfriends From the Trash Bin System is the ML but it's like the ML died and became a system and stuff? Also it's BL. I'm not sure about the RPG elements though.