How does this connect to Riviera? Or..

[Soushi_Grapple]

better yet, how does Dept. Heaven connect altogether? I know that Yygdra had a cell phone game and another game coming out, and the third game has yet to be announced out of the series of 4, right? X.X

[Enzeru]

(imaginary bullet point) All worlds share the same Asgard
Each takes place in the overworld and eventually dips into the Underworld or Asgard


...That's about it, I think. Tome of Lost Souls has more on this, methinks, and if you know Japanese, the Dept. Heaven Episodes World Guide is like the god of Dept. Heaven.