the main issues with Yozakura Quartet anime adaptions are trying to fit a whole bunch of things in and still leave open endings because the manga isn't over yet
or in the case of the first adaption, doing an original ending because it was made in the early-mid 2000s and original endings were the thing to do
it's the kind of series where you either infodump everything, or don't really explain a lot because it would take too long
that said, Hana no Uta is a good/faithful adaption but has a small jump that takes place after Hoshi no Umi midway through the series
it's also fun to find voice actor overlaps with Durarara because they share a character designer...though every adaption aside from the first one has more stylized designs