User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-43933896-20200219194013/@comment-39047410-20200219194135

Draconis Deusu is the name of DxDU. Where Issei and others live in.

Fadiru x Ferudora is the name of FxF. Another universe that ExE and the UL conquoered already