Satella is a formerly human Dark Lord noted for being the close childhood friend of the Supreme Dark Lord and Leader of the Hornet Faction, Hornet, the daughter of the now deceased Demon King Gi. In the year GI0859, Gi brought Satella specifically to be his daughter's playmate and the two would grow together as friends until they were both turned into Dark Lords. 

The manga adaptation of Rance X, the conclusion to AliceSoft's 30 year old Rance series. This manga adapts some events from that story and has some original.