In Pre-Tri-Tech Century, 21st Century, and/or before S7
Lucifer left the underworld and ignore his role as king of the underworld, he want to spent his eternal life on the surface while the gosei archangel doesn't accept his change and demand him to back to underworld and his job or there will be war between angels and devils, and the human will be in crossfire. Some prisoners escape the underworld and wreak havoc. Lucifer was given chance to fix the mess as he partner up with his brother Michael, who is now girl after regenerating, and Saba.
In Tri-century and after S7
Yin and Yang maybe descendant of Devi. They are resemble to Lucifer and Michael. They maybe connection to the Archangel siblings in the past
Two pair of heroes, two different times, one destiny
updated: No reflections