The problem is that Chitose tsundare arc gets annoying as its all tsun and no dere, Haruma also doesnt help because he never gets mad at Chitose or gets fed up and starts to ignore her as it looks the entire relationship is just because it have to exist for no reason.
I get the author doesnt really want to do extensive drama but Haruma should got fed up and start to look at other girls instead of being so entirely deadset on Chitose who never gets her position challenged and takes him as granted and thats kinda the issue with this, the relationship is frustrating because Chitose is not a fun character and her status as main girl is undisputed.