Board Thread:General Discussion/@comment-112.204.218.141-20150303034342/@comment-24.13.229.27-20150310022704

-Taken from Stack Anime :D
 * Dee appeared as a ghost because her physical body was still stuck in class 3-4, while Alis had a physical body outside because he was already buried by a proper gravekeeper. Therefore his body wasn't in class 3-4 like Dee, and could appear normally since he was part of the world outside.
 * Dee has a physical body later on because the world class 3-4 created had been destroyed. Her physical body was released.