Akihiko Watanabe was a japanese sorcerer who specialized in enslaving magical creatures and using them to his ends. In addition to this, he was able to prolong his own life and youth by sacrificing his bloodline to dark powers.
He used all of the creatures at his command to try tracking down his grandson, who was spirited away by his mother long ago and hidden by massive wards to protect him. Fortunately for the young man, his case came to the attention of the Spook Squad, and they were able to make arrangements with the sorcerer's servants to attain their freedom in exchange for non-aggression.
Akihiko was killed by the Spooks, and his Demesne was turned over to the rulership of his grandson, who was the rightful heir.