The character development of this series is way too diluted.
Post movie the major arcs in the manga pacing were a nightmare for a weekly series mind you.
TLDR
After movie arc, the matriarch invites the FAMILY and Chizuru to a pool trip, Mami invites herself in because Kibe, the self proclaimed MC's best friend has a loose mouth for the Nth time, and Mami sweet talks her way to the Granny to get in. Ruka also gets in if others can get it btw. Mami finds out Chiz rent side job and wants to blackmail her but Chiz is under pressure so much that in this very arc MC decides to confess his love for real to her but Chiz is so out of her mind she just walkts away from MC who was still confessing just to answer Mami's phone call, this outraged many because this arc took a hit on Chiz' character and everyone were hating on her, Kazuya saw this as a rejection, got a mental break down and got depressed, then the infamous 218 happened, one thing was MC imagining Chizuru with other men but to add extra salt the author made MC grow a hard on while imagining THAT, the internet was merciless to the author because it hit on Xmas of all thing, then for the first time in years the manga took a week of hiatus and returned, many suspect during that time of lapse the editor in charge of RAG got fired because posterior tankoubons afterwords the author thanks a different editor for working with him.
Anyway Mami wasn't getting her way as she wanted so she just exposed Chiz's side job in front of everyone trying to push Chizuru to shift the blame on MC who was an emotional mess unaware of what was going on , paint him as a creep, stalker and blackmailer, so of course fucking Kibe hits him no questions asked first, then Chizuru after so much pressure decides to save face and kiss MC in front of everyone lying that it's true it's was how they met but she likes MC for real, everyone calms down and let it pass, nobody apologizes to MC who was still clueless abou what just happened with everyong jumping him like a bunch of robbers.
Afterwards Mami rants on Chizuru for not obeying and Chizuru just calls her jealous pissing her off further.
Next arc is cohabitation arc, Kazuya's room burns because of gas leaks. Chizuru feeling all the shit from before was her fault lets him in her house which btw is huge because she inherited it from her late grandparents. Actually a decent to good arc because they cohabitate like normal person, Mini makes a comeback after being left out for the pool arc and she makes them stop acting like idiots.
MC doubts if this was helpful at all, Chizuru is pretty much always with a poker face, Umi also makes an appearance, Chizuru is mildly annoyed at him because he used his connections to find out her place only a few people know, likely one of her school "friends" sold her out because most of the time they fall for Umi's handsome face and become loose mouthes.
He is there once again to tell her to become his gilfriend, and the moment she is rejecting him for the third time he stops her and really begs her to think this through carefully and will give her enough time to think about it and leaves in a taxi. MC and Mini saw this all, then some days later MC's found a new place to live so he has to move out, they go on a date again and she tells MC she can go out with him yet because she still is not clear on her feelings while still doing the actress and rental side job (this caused another viral on websites claiming she rejected him which was of course a lie, they just took a caption and started grifting about it, if you saw that manga panel with no context you got duped by a grifter, I don't like this manga but I dislike grifters far more). MC is ok, unbothered but neither happy, thinks later that maybe it's time to move on and hops in a taxi ready to go to his new place to live and when he was getting sent off by Chizuru she just jumps in the taxi and gives him a deep kiss leaving him once again confused. A new arc is on going but still too early to make a TLDR about it.
Hope it helped you as much as it annoyed me to write lol.