from Cireus-Anime:

In an age of chaos, the four governing spirits of wind, water, fire, and earth reigned. There were those who could harness that power to cast spells, and there were a few who were blessed with the ability to hear the spirits voices, and those people were endowed with the ability to control the "Darkness Rage", "Luciffis" . . .

Twins, Rudius and Mattie, are on the run, trying to escape the Spell-Caster Monks, who are trying to capture them to take the Luciffis. When the two are separated, Mattie turns to a fortune teller named Kishiru Mishuru to enlist her help in locating her missing brother, and that's where the story begins . . .