User blog comment:B214/Talk About What You Want! 3/@comment-24098614-20150415224645

I have been examining this does Rias likes living in the Human world more than in the Underworld because she commented on this on the Light Novels, and it is great that the Maous made the Underworld suited for the Reincarnated Humans because my notion of the Underworld was a place in darkness not this world that resembles a Human world with a sun, and the equivalent of a day and night.

This was a pretty good idea for the Devils to do this to make the transition for the Reincarnated Devils easier, and they also given this world a similar Timespan as the Human world quite ingenious as well it must have taken a incredible magical power to create something like this.