Well, what you are looking at is the Garden in which the inhabitants of both UN and RoS, they are connected (same world and all) but separate at the same time. I'll go indepth.....

Above is the Kalpavriksha and the Land of Milk and Honey, the top world is a land of peace and tranquility as well as natural dangers. The one who controls the top is aforementioned Kalpavriksha-The Great Wishing Tree and yes...he's that freaking huge, of course to dwell inside the Garden he comforts to the appropriate size; however Kalpavriksha enjoys and monitors what he sees as the day to day antics of his creations, recently, he's chosen a Divine Mate in the mortal Deva Soma...who's none too pleased about that.

The Middle is the combined world of the waters and the Ocean of Milk, the nectar that feeds all within the Garden.

Below is 'Rasa', the UnderNod, a place where darkness is seemingly forever...it is a land of primary night (There is sun but its more commonly known as a dark place) and all the pleasures and dangers that go with it. The UnderNod has only one controller, Varuna, he guides the dead into the Underworld as well as churns the Milk....

If you want to read Rights of Spring Season 1 Click Here!