This is getting me really annoyed. The author really hates Aina if he's gonna pair her with Kouhei. I've been waiting for something good to happen with her and Iori since she first joined due to the setup. At least pair her with an unknown character off screen after a time skip if you really want her to lose and paid up with someone...
I don't understand the love for Aina, to me she's a funny character for her reactions but as a human she's mediocre at best. Like Iori has a redeeming quality or two. Aina is very selfish and superficial.