I haven't got a copy of the game to hand to check, but if it's the one I'm thinking of: Once you advance far enough in the storyline, Antlers starts bringing the MC to a company party every Thursday night. Once you're there, there's a story event (triggered by speaking to the waitress, if memory serves) where the MC ends up inadvertently smuggling a suspicious data crystal with some faked data throwing suspicion on Antlers.
There are a few options for what you can do with the data once they have been intercepted, but they don't lead to much for now (one option leads to a bad end, I think).