Ayana has been drowning for a while so Riku actually focuses some attention back to her. But Kana isn't going anywhere: girl gets to have her friend's boyfriend lean his head on her, she steals a cheeky kiss from him and now Ayana learns she's in a love triangle with her friend. The writer really loves Kana a lot, huh?
This is so bad I won't be surprised if rather than getting clamjammed by that revelation, Ayana somehow proposes to Riku that they involve Kana too. It's so trashy that I think even pregnancy drama later on is not off the table in this story.