there are so many things left unresolved
As I recall there was a debate about who should be the new president, between yuzu and harumin's sister, which we never heard from again.
That was Yuz vs Mei actually; Mitsuko raised the stakes.
We don't know anything about Mei's biological mother.
I'm guessing a divorce settlement? Maybe arranged marriage blues. I feel like Mei's biological mum didn't want to be around the Aiharas anymore.
What happened to the manager? Did he marry someone else?
Probably he's enjoying the bachelor life of a successful businessman.
What about Shirapon and Himeko's supposed fiancees?
We'll never know. Personally, I don't care. The mention of their fiancees seems to be a minor plot device.
What happened to yuzu's friends?
If the wedding aftermath is any indication they're probably shedding their homophobia off.
I still don't understand about arranged marriages, this is not 1960, you can inherit something without the need to get married
Neither do I. But the reality is it still persists in some cultures. In my country, the arranged marriages happen between people of equal social status. In some Jewish communities they have this "Shadchan" person.
I know it's a yuri manga but they could have given Ume and Shou some development, basically Sho
give his daughter to a stranger.
I can't see the connection between the two points but I think Shou accepting Mei's raging lesbianism and her subsequent marriage to Yuzu seems to me a kind of atonement on his part.
If Sayaka is so in favor of school rules, then why is her hair dyed blue?
I think it's a sort of saying Sayaka is a character to watch out for. Look at Matsuri and her brilliant pink hair, boy did she make an entrance.
Mei at the beginning of the manga acted with a lot of confidence and whenever she had the opportunity she tried to fuck yuzu (until yuzu had a virgin panic) what happened to her now?
Cucked. By Harumin showing how to treat Yuzu right.
Why were some characters literally discarded?
Can you clarify on this one? Which character are you talking about and how do you think they were discarded?
Why are there so many coincidences in this manga? First, Mei and Yuzu become stepsisters by chance, then the manager turns out to be the fiancé, then it turns out that Matsuri also knows him and many more
That's Citrus universe for you.
Well SaburoUta basically said: "Fuck the development of the story, I want more Mei goinf blushy blushy hehe"
Actually sums up the sentiment of your post.