@mrnone Ruka's the worst girl for him. Zero chemistry and 100% forced interactions. Basically Domekano's Rui, but a lot more loud, but not less toxic.
Kazuya's only flaw was not cutting things with her when she forced him to take her to the hotsprings.
@idk234 she got angry with something Umi said. And when Kazuya asked about her opinion on haing a boyfriend, she used almost the same exact words Kazuya said once before (don't remember the chapter, but Chizuru's answer to Kaz's question was quite similar to something Kazuya said before).