Bit late. Since I've been through so many exp, I can easily agree on why story ends this way.
*Rule number one: If you think you're in advantage being her childhood friend or "I've been friends since forever", you're definitely not getting your relationship anywhere . Logic. If she's is CURRENTLY into someone, then your best bet is just stay close to her and just do your daily routine. If you managed to be her consult friend, it's a bonus.
*Rule number two: I'm not gonna type this but again; Going full force into someone might be a good idea, but know the fucking MOMENTUM. If you try to get into a triangle, you either place a huge scar on your crush or a good amount of " Back-up feelings" for later on. The latter rarely happens.
When everything goes well, (eventually) maybe they will somehow shows bit crack on their relationship; or maybe they break up. That's your best chance to strike her.
And boy that is also why I'm having scary feelings when Chika told Hanai that she will still be trying.
Nothing comes in eternity, that's why time plays big role here.
Anyway 7/10 for the whole plot and drawings. And could've been 9/10 if you fucking sit your ass and stay still Chika.