THE INCUBUS - Origin -

Vegas lives as a demon hunter in order to take revenge for the death of his parents, who were killed by a group of demons. One day, Vegas planned to execute a female demon who possessed the same demonic aura as the demon that killed his parents. However, Vegas decided not to execute her and chose to free her instead, after having seen 'something' from the female demon through a special ability he possesses. Vegas never thought his actions that time, would lead to a massive change in his life.