Total Recommendations: 1
If you liked
Charlotte
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...then you might like
Boku dake ga Inai Machi
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Both animes have a main character who starts out as lonely and doesn’t have very many friends, but in the end they grow to have close friends around them. They both are pretty sad and involve changing the past/future. There are lots of similarities, and I guarantee that if you like one then you like the other.