A hundred years ago, when the platform of "Daily Killing" was just born, it was a still disordered age of wild competitions. Many unqualified gamblers, mercenaries, space pirates, and desperadoes joined the trade that barely had any threshold except for courage.
Having fought a bloody way out in the competitions and thrived when thousands of other assassins had failed and perished, the four assassin groups naturally had their specialties and unquestionable capabilities.
The creators and leaders of the four assassin groups also became the four gods of death that everybody was scared of.
They were—
Black Flag King, leader of "Black Flag"!
Red Lady, leader of "Bloody Skull"!
Hanged Man, leader of "Life Claimer"!
Revenant Of The Dead Sea, leader of "Lamp of Death"!
