1000 years ago a darkness fell over the continent. Demons, and monsters would emerge from the darkness slaughtering everything. To keep themselves from extinction humanity created three groups of warriors to fight the darkness:Hunters, Royal knights, and Battle mages. The Royal knights the most popular for their strength. Battle mages were praised for their ability to keep the darkness from reaching their city. The Hunters were the least popular, since they would have to enter the darkness and fight monsters head on trying to find out the cause always failing losing more people than monsters killed. Until five people appeared. Astaroth Markos born of the darkness and created to look human to destroy them from the inside. He is the most powerful dark being. Rubīrōzu Mei born an orphan and joined the Hunters at an early age. Fifth strongest hunter Cranus Thorn born in a rich family joined the Royal knights at fifteen. Eighth strongest knight. Cain Mevra born in poverty was bitten by a demon and survived joined hunters at eighteen. Tenth strongest Hunter. Seth Markos born of the darkness created to look human to destroy them from the inside. Second strongest dark being.