Board Thread:General Discussion/@comment-107.219.185.91-20140105042639/@comment-72.10.223.93-20140219162837

Yuri says that they know when a person is an NPC and when they are human (with the exception of Ooyama, but Yui's quite different from Ooyama). I assume that's how they knew Yui was a human instead of an NPC. In adition, there is time in the Afterlife. Why else would the Programmer wait around? If there wasn't time, then there would be no point to waiting for his loved one to arrive again in the Afterlife.