There were two creatures before humans were born Kings and demon knight were the people who protect the earth and
animals but demons tried to destroy it but after the knights died there sword held power for its new master with a book with all the abilities written on it and the top the knight are the prine king and queen.
In the future our main charecter was Mark an orphan with F rank the weakest and S rank is the strongest of all. Only 7 S ranks are there in the whole world.
Mark was the slave in a D rank hunter team.He soon got fired but one day he saw a light then when when to where the light was coming from he saw the 2 remaining godly scythe and sword.
He then when fir traning .3 years late he first met a demon that was s rank and killed killed him after becoming so op .