Four main entries were released across the 2000s and early 2010s - Riviera: The Promised Land (2002), Yggdra Union (2006), Knights in the Nightmare (2008) and Gungnir (2011).
The main character, Ein being a resident of Asgard, is sent by The Seven Magi to rid Riviera of demons and becomes tangled in a bid for the Gods' dormant power through The World Tree.
Riviera focused very strongly on the story and character interaction, even going so far as providing the player with the opportunity to slightly affect the ending by developing stronger relationships through his actions with particular female members of the cast.
Another unique aspect of the game is that the on-map formation of your units is very important, creating the eponymous "Union" system that is vital to victory.
The player leads the Wisp through the story, unraveling the past through the events of the present, in order to save Aventheim.
A story that takes place in the Gargandia Empire, set to a backdrop of racial strife between the noble Daltania and the peasant Leonica.
A fifteen-year-old boy named Giulio Raguel, who is part of the Leonica resistance comes upon the powerful demonic weapon Gungnir, and his choice to use it for the sake of the rebellion has drastic consequences.
[5] In a later Dengeki Maoh article, it was revealed how each game interacted in the Universe, each initially taking place on the overworld and being connected in some way to either Asgard or the Underworld.