I understand that thing about Chihaya.
I have trouble feeling angry at someone for a whole hour straight, tend to forgive and forget those things easily, is not like hold a grudge benefits anyone.
At the VN I never felt either that she genuinely hated Koutarou, more like being a bit annoyed at him whenever he did or said anything stupid, but mostly OK the rest of the time
Lucia on the other hand feels way more tsundere (VN Lucia route spoilers) until the dating starts