Y'know, if it turns out that this manga doubled up on the lovelorn childhood friends just so it could result in twice the heartbreak when the lead characters stay together, I won't be surprised, but I'll probably still scream. Just like, one would have been enough! We really didn't need two! The only reason to include them both would be so it's a good thing when the leads break up! But spending basically a whole chapter on Kurumi saying "if you love him, just go to him" really makes me think that Nika will come back to her in the end! Gah.
That would be the most cliche of results tbh.
Personally I wonder if the story won't take a path like: Nika goes to Jun to confess, Jun rejects her again because he really only likes her as a friend. Nika then goes back to Kurumi, they're happy for a bit, on the surface, but Kurumi can't really get over being Nika's second choice and in the end they break up as well.
Then end it with Kyou confessing to Kurumi, and well, either end with super heartbreak or a glimmer of hope.