I'm going to assume you've already seen Clannad, if not watch it first or this anime will make no sense and you'll kill the enjoyment because you won't be "close" to the characters.
Clannad was a comedic, sad, romantic, show, with comedy being the predominant characteristic. It was not very tear jerking, and the romance was a bit broken up. Clannad: After story retains some comedy, but will have you crying to the point of needing a storm drain. The plot has twists and turns you'll never see coming. They are extremely depressing, the show pokes at some of the fundamental, primal, connections we all have. Such as motherly instinct, love for a child, father and son/daughter relationship, long lost whatevers, and a hell of alot more. You WILL cry, I guarantee it.
You'll have alot of fun crying your eyes out, even though the strangely fitting happy feelings you'll get will feel out of place but oh-so-right will only amplify the experience.
Another thing, if you reading this and thinking you won't cry, you are dead wrong. Because it takes ALOT to make me even feel sympathy, this anime made me realize I actually have a soul.
Overall: Incredible story, depressingly sad, I can't find much wrong with this show, the animations are great, any flaws are unsee able because of your blinded by tears. 10/10 true masterpiece
