 If you liked
Kanon (2006)
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 ...then you might like
Little Busters!
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Both series has that relaxed feeling with elements of romance, comedy, and drama.
Kanon and Little Busters! are also associated with Key so expect some sorrow and emotions. Both series also take place at a school life setting with the main protagonist having interactions with the other cast members.
Both series also similar artwork and character designs.