Wait, what? It's the red-haired one in mine.
What choices do you make to get black-haired girl?
Just follow the Lovers path. Basically, let her stay home from work every time at the start, take every chance to see her, follow Sam's advice, etc. The exact choices for most of the game have been shared here and there. As for the choices related to the latest updates, I think that if you get to the camping trip while on the lovers path then you don't need to do anything else. Just in case, after the cancelled camping trip, I chose to fuck the gf the night I got to see her, let her go out with Sam to go shopping for clothes without any issues, avoided any of the netorase-related choices (it automatically moves you onto the happy path even if she didn't cheat), told her to go home early during the bar event, and gave her good pointers for the university one. Also, you can let her stay with the students with no issue (if you gave her good pointers).
But Matt fucks the black-haired girl around the time of the bar event, so half the choices I mentioned are unnecessary.
