Well unlike Key's other titles Clannad isnt an ero-game its actually the only game Key has made so far that doesn't show the girls in "adult" situations. The after story in game is when you go through or complete the girls "path" misae's, yukine's, kotomi, ryou, kyo, tomoyo, fuuko, komura,(yea the old guy....), and Nagisa as the final path; when After story is unlocked you finish some stories from before. By the looks of it they are going to go Nagisa's final route as to how they are going to show the final 4/5 stories is ....idk. To those wondering parts of this ep really did happen in game and its all a set up for their After Story.