 If you liked
K-On!
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 ...then you might like
gdgd Fairies
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gdgd Fairies really is a one of a kind anime and so finding a similar show is difficult. I'd say the main appeal of gdgd though is the conversations between the three primary girls that take place. Based on this I'd say K-ON! could be a good alternative as this is also primarily driven by the conversations made by the female cast, although with K-ON! it is 4 girls which later grows to 5. The humour differs a fair bit but the overall tone in both is light-hearted and fun.