One of my favorite anime series, 12 Kingdoms, is based on a series of fantasy novels by Fuyumi Ono which have been licensed in the U.S. The first two are out and I read and enjoyed the first one. It was a little slow, but still very good. They changed a few things in the anime and the book made a lot more sense in some ways.
The author has also written a manga called Ghost Hunt which is worth reading.
It was the first time I had read a Japanese novel and I really enjoyed it. Any recommendations or comments about a Japanese novel?