 If you liked
Nana
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 ...then you might like
Mahoutsukai ni Taisetsu na Koto: Natsu no Sora
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Both are about young people leading their lives in a city. Even though Mouhoutsukai ni Taisetsu na Koto focuses on supernatural elements the way the drama unfolds is rather similar. Also, both shows focus on relationships and how people handle those relationships. Without spoiling anything the way they end is quite different but that doesn't take away from the overall atmosphere and experience.