[Angelic]

The only thing i dont understand in this anime is that afterlife(the actual after life with that robot ) . i mean thats totally out of contex

Here is my take on it...

Spoiler:

It is an alternative universe, that I made out from it. Nagisa's death caused such an emotional impact for Tomoya that all that was created, the robot being a light. Just my opinion. There are other things that people think it is, but I like to create my own as well.