 If you liked
Nana
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 ...then you might like
Gozen 0-ji, Kiss shi ni Kite yo
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These two mangas aren't too terribly similar but they do feature music and romance. "Nana" takes a band spin and "Gozen 0-ji, Kiss Shi ni Kite yo" takes an idol perspective. I've read a lot of manga related to this theme but when I read "Gozen 0-ji, Kiss Shi ni Kite yo", it made me think of Nana - possibly because the main character's name is Hinana. "Gozen 0-ji, Kiss Shi ni Kite yo" is much more light hearted than "Nana" but I still enjoy it a lot!