Everything goes downhill when the prince of the strongest reigning royal family attempts to end his life, and a mysterious assassin in a mask saves his life.
Kasai Shiromaru- a hitman working in the deepest and darkest corners of a world that is falling apart.
Hikaru Tsukumo- a suicidal and idiotic prince giving up his crown, who probably needs solitary confinement.
The tides turn rapidly as a fatal outbreak of a strange illness takes over, and both are thrown into matches in a dystopian world where they have to fight to the death in order to save everything, as the blame is placed on Elementalists for causing Mana pollution, a deadly evolutionary evolvement that went along with the gaining of elemental abilities in humankind.
Will they be able to solve the mystery of the Underworld creatures that are slowly destroying everything?
Or, will their plan crumble apart due to their Elemental Abilties being discovered before they make it in time to solve the ongoing mystery?
