Dawn of a Thousand Sunsets - Vance R.E.

Japan is the land of the rising sun.

Great place for a vampire.

But that's exactly where I have to go to find my missing soul. A few weeks ago I was, briefly, turned back into a vampire, which meant that I lost my soul for a day.

When I first lost my vampirity, my soul came back. For reasons I don't understand, this time it didn't.