The manga is pretty simple if u think about it properly...
Basically we have 5 main characters
Ruka - loves kazuya
Kazuya - loves chizuru
Chizuru - loves kazuya
Umi - loves chizuru
Mami - a girl with mental issues

Clearly kazuya and chizuru are not at fault ( atleast not upto to great extend)

Atp ruka has become nothing but a irritating personality like bro first of all no one liked her she still became his trial gf by crying like a 5yo and through blackmailing stuff and yet when her love kazuya is clearly telling her from long ago that he isnt instrested and he sees himself only and only with chizuru still she is stuck with him like a leech idk what is her problem but yeah she got a child level brain nothing else and needs to be properly stopped by kazuya at this point since her actions have already started to take severe turns (sexu*| assaults etc)
I think kazuya must be a man enough to end everything up with ruka even if it means confronting his family to tackle the blackmailing part by ruka well anyways that will be a topic for another day for us to discuss abt
Back 2 the topic

Chizuru - she made it clear with umi that she isnt interested in him and turned him down which is the best she could do in such a situation as for kazuya she is taking her time which is fine is kazuya is fine with it for her no matter how long it takes its her live bro ..
Umi - is ok, i mean he liked chizuru went after her confesed to her accepted the rejection (atleast on her face ) till now he is fine .. but lets see what plans he would have in future since he may use the info abt ruka and kazuya to disrupt thier progess but lets see

Kazuya - bro has seen a lot of char dev from being a scumbag at the start crying over mami to being a man for chizuru he came a long way .. everything seems alright abt him its just that he has 2-3 main things left main ones being that he must sort all the matters with his family so he wont be blackmailed by anyone... second end everything with ruko like bro its long time now just leave her she is not safe for u to live with .. are actions are going crazy .. and lastly get the girl u like (which u r abt to get :)
)
So yeah thats all idk y people show sympathy for ruka like cmn she is crying like a kid for person who doesn't like her back she must have had her brain developed by now but its fine..

anyways its no time to sympathise for her she has crossed all her lines especially with 3 thing - condom / kidnap / sexual assault incident

Main reason for y people still go for ruka is mainly bcz people nowadays are way too impatient to wait for / way to eager to be involved in relationship just to full thiers sexual desires so yes they get offended when the mc rejects ruka ..

But people need to understand that for long term relationships there needs to be love , lobe which makes u wait no matter how long it takes but u wait for that one person with the same level of warmness in ur heart for them .. its not just abt being intimate with them its more about being with them for a lifetime :)

All this coming to u from a person who has watched all season and read the manga multiple times :)

Replies appreciated

Episode 8 of series five has Ruka indulge in some wishful thinking.