If you like clannad and want another tear jerker Air is another option.
Though if you want more of an emotional roller coaster, keep an eye out for an anime called 'Little Busters!' in the future. It's also a VN done by the same people who made Clannad, which recently got an okay to turn into an anime. While I didn't think Clannad couldn't be beat after I finally read the Visual Novel, Little Busters! I think is just as good, if not, even better.
In After Story you will realize that your body is giving you the big finger and doing it repeatedly!
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