600 year's ago a big war started,
Human's were at peace,living there live's to the fullest,earth was full of happy people..
BUT..one day the gate's of the underworld opened,the demon's spreaded havoc all over earth they were slowly devouring human's..alot of people witnessed earth slowly getting destroyed by the demon's,all the human's saw they're family member's getting eaten by the invader's.
One of the human's who witnessed they're loved one's getting eaten was KAGIYAMI a 18yrs old teen from a village called RANGAKO,he hated the demon's so much that he went to one of the demon's and puched it in the face while shouting " I HATE YOU "
When he shouted that a lightning struck his hand the lightning formed a sword,its color was half white and half black,he cut the head of the demon he saw using the sword he continued slaying the demon's he saw to protect the remaining human's in there place,from then on the sword the sword was called " DEMON SLASHER " he fought the demon's with that for year's,they made a village far from the gate of the underworld..they lived there for many year's without worrying about the demon's,KAGIYAMI reached the age 38yrs old and then disappeared never to be seen again,it has now been 600yrs since his disappearance and he still hasnt shown a sing that he was alive,people are still waiting for a new human to weld the power of the " DEMON SLASHER ".