Let me guess the other girls are nearby. It will be Saki who will tell him to make her his girlfriend. But on the condition that she gets to date her as well.
Here is the deal:
The real reason why she was unhappy with Naoya. Yes she wanted his full attention. But a small reason was that she was jealous. She also has feelings for them.
She drugged him like nino
And she was willing to go to the bathroom in front of him. (Yes the chapter when she tried to block them from their house until they let her in)