Sorry late replies. But like I said, you're lacking love points. If you take them to the beach/pool during weekends, you can farm the points you're missing.
Here are couple screenshots to show where I'm at.
Look at your hints, Hibiki is lacking 2 points. Take her to the beach/pool on weekend.
And, while you're at it, exercise and study in your room to meet the remaining two girls.
Cool
