I honestly think she's a good partner for Iori. They genuinely would make a good couple and every interactions they've had felt right since they pretty much have the same personality. Not to mention, during their date she knew exactly what Iori would like and made it so he had fun on the date, yeah it was for her goal of hooking up with him, but it just shows how much she understands Iori and accepts him for who he is. Cakey should go with Kouhei, since honestly she the only "3D" girl who managed to genuienly catch Kouhei's attention. As for Chisa well, I never liked tsunderes to begin with, I mean compared to Sakurako who had less screen time, yet had the most progress with Iori. Chisa should just stay as a very close friend who share the same hobbies (Not to mention she's literally his cousin, blood related or not)
If you don't see my comments for a while, I'm letting the manga/manhwa cook more chapters.