Ex Yakuza. Known as the Wolf of Love by his friends and enemies, he was more a romantic than he was a fighter.
Ai died in 2001. He was quickly taken under the wing of several Fujin who could not find a suitable host for him. Eventually he was drafted into the ranks of the Dark Lord, where he was used as a scout to watch over the mortal realm. His first Heirogamy was in 2008 and didn't last long. He was quickly separated and kept in seclusion in the fortress of the Dark Lord.
With the arrival of the prophesied Champion Over Death, he has been tasked with guardian of the most important man in the two realms.