So I just finished watching the final ep of Clannad AS and I'm havinh trouble putting the peices together.

When they were showing how Nagisa survived child birth and how they raised Ushio together; what was that? Could it have possibly been an alternate world that kotomi and the robot thing were talking about? If so, what happend to the world we've been following all along?

Also

Was fuko the robot and Ushio the girl from the other world?

Thanks to anyone who can clear this up for me!