When a sentient video game character falls in love with the real-life player, she must get rid of the other characters to gain the player’s affections, even if that means rewriting the game script.

Nicely done. This has perked my interest. Learning myself. But it seems concise and creates a desire for me to see the story

That's an awesome idea! Agree with the other comments that some details should be fleshed out Depending on which genre you wanted to use, action, romance, etc. (both sound great), maybe she's trying to get the player's attention but he's easily distracted or maybe there's a ticking clock like he's either renting or borrowing the game but is getting bored with it.

Yes. It’s a game, not a film.

I'm a little confused, is this film already made?

Good point. How about this:

When an NPC becomes sentient in the middle of a dating sim, she must hack into the game code to divert the attention of the real-life game player away from the other romantic interests before the game ends, or risk being stuck in the game forever.

Good point about the use of accurate terms.

It is an existing story but I didn’t include the title because it’s part of the spoilers.