If you check your own hints, you'll see that need love points with several girls. You probably need a few more with Hibiki. Choose her on the beach/pool dates to raise some.
I was a little confused when I ran into that point issue myself, I knew that I needed more points but in the current build you generally get enough points from their path and sundays, and maybe from other girls paths, that was the only time you had to grind affection so it felt weird af.
especially since at the time I reached that I only had access to the beach and could only get 4 points a week (if I could afford to go both days) and needed a few weeks worth, ways to gain points outside of the weekend would be nice because at the time all but 1 path was blocked by Hibiki's progression (either directly or needed me to progress another girl who needed me to progress Hibiki) so it felt like the entire game just kinda stopped for a few ingame weeks.
the only other time the game progression felt off was towards the end when I'd exhausted everyone's paths but still had a couple sunday events left so was just grinding skill points and money but I get that that's mostly cause the game is unfinished
looking forward to future updates ^^