I refuse to believe Saki didnt know about boys intentions. Chika was just being a busybody and ruined Saki's hussle for a free ticket.
This development mildly annoyed me tbh. There's nothing wrong with going to the concert with that boy. The ticket was a no-strings offer, a free gift. If he secretly expects something in return, that's his problem and Saki is not bound by any of that.
Chika acted in a way you see a lot in mainstream boy x girl romcoms. The girl has a chance to do something that she likes or that is good for her but that will also make her closer to other boys in the cast, so the mc boy sabotages her plan (without explaining his reasons) and afterwards keeps pretending he isn't interested in her. This always struck me as perfectly crappy. If he cares so much he should ask her out and start dating her; only then he would have valid grounds to tell her to turn away other guys. This is what Chika should do if she wants to stop Saki from getting too close to other people: claim her! Not get in her way with half-assed excuses.
Hmm, I mean, as she said, If Saki still wanted to go, then it is up to her, and Chika did said that "I've done my part in warning you", so at the very least, she doesn't really forcing Saki not to go with the guy and "sabotaging" it, she just said that the guy might have expect more from her (And fall for her even harder, not that I think that's bad) and as we know, whether we like it or not, some people get forceful when show a little kindness (cant find the right word for it, but you get it). Just correct me if I took it wrong.