In the PSP version, additions were made to the story that further develop the Dept. Heaven universe and story, deeply tying the game into mythological elements first developed by Riviera, with the more direct appearance of Diviners, and Grim Angels, and passing mention of Malice, Hector and The Seven Magi. With the events of Yggdra Union's PSP ending where the Royal Army attack Ragnarok, this is now cemented into the canon storyline, marking Yggdra Union as a prequel to Riviera: The Promised Land.