First, Kanako realized that Chisaki liked Ueno-kun because he supported him throughout the game and defended him from the others; if he didn't like him, he wouldn't have done that. Chisaki got jealous when Manaka went to help him, and Kanako was scared when Chisaki went to congratulate Manaka, thinking he was going to say something to her. She's waiting for Ueno-kun to realize Chisaki's feelings for him because Chisaki doesn't like other women getting close to him. What happened with Riku was a big deal; he just knocked him to the ground and that was it. Besides, he came out on top because he has a girlfriend, the one with droopy eyes, because it's clear she supports Riku a lot and didn't suffer as much as with his clubmates.