This manga was so good at some point it became erratic, i don't undertood what the author wanted to do. I'm guessing she was tired and could not manage to explore more the depths of each character properly. I enjoyed but that final was weak.
In my opinion Kazuya was really an pain at the start but it's more on Chizuru side now, she's being a dick for no reason, just say no and end the series instead of makes him have expectations.
This serie is a pain.