In a world where Almighty Messiahs exist, there was once upon a time where the Supreme Being gave birth to weaker entities, dubbed Messiahs like Ra and Niaz. In order to control his vast power, he had resorted to splitting himself beyond 5 dimensions. Otherwise, his existence itself would have shattered reality. Martyrs, like Boryu, today have a vendetta against Ra and Niaz.
Messiahs are god-like beings who have been ruling over the universe since the beginning of time. In modern times, humans start to disdain the way that the Messiahs have treated them. Some even went to form groups that tried to assassinate the Messiahs. Those people are called Martyrs.