Dark Blood

Nikorasu has always been alone. Ever since he was a child, he's been fighting on the front lines working for the Vatican to slay all demons. He has a secret that only he knows.
Teo is just a mere boy, trying to make a living. He later learns of his skills with a sword and his supernatural magical abilities, which will prove essential for survival.
When Nikorasu becomes leader of the Vatican's Assassination Branch, their paths cross.
Whether this results in order or chaos will soon to be discovered.