Okay, I’ve jumped the gun on this episode. It seems that neither these two would talk about their fateful encounter with Yukinon, where Hachiman saves Yui’s dog from being run over by Yukinon’s car. Heck, Yukinon didn’t show up at the fireworks display. (Oh Hikky, just fall in love with Yui already!)
Instead, Haruno-neechan takes her place instead. Although she realized that Yukinon’s ride almost killed Hachiman and Yui’s dog, it’s not like she’s at fault because Yukinon is a passenger, and not a driver.
Alas, I have a feeling that Hikky would return as a loner, and Yukinon might become like him too if it keeps up.