I see 3 pairings with the MC and the most interesting would be with Aoi. But I'm conflicted, because I doubt Aoi can get over her obsession for Hanatsuka easily and also, she's broken (or in the process of breaking?)
But what I get is that the MC, by looking in the eyes of Aoi and experiencing the "violence" of her feelings, realized that her own feelings were empty, shallow and not love. That's why Aoi "wins".
If it turns into something darker and psychological, I may up my opinion on this.