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All of them flow pretty well except for Fuka Fukuyama. Its the alliteration. Mana Shinohara might have two many N sounds but it's not bad.
Overall I like the names. They seem to fit their era too.

I think for Haruka you could go with a sort of softer surname. Aoki would sound good, for example
Aoi, it seems a bit like a mouthful, but it's sweet
For Mana, I'm a fan of the last name, but not really of the given one. I don't know why (I adore Hana, which is just a letter off) but something about it seems eh to me
Fuka, try a different, non-alliterative surname. Perhaps Hamasaki
Nanami Kurosaki flows very well. It's gentle and overall soothing

Miyamoto Aoi us my favorite, it sounds the most balanced and aesthetic.

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Fukuyama Fuka sounds comedic, I don't like the repetition at all.