as a 5th book was published in german recently I got to recall
Tales of the Otori, written by
Lian Hearn, a kinda historical fantasy
saga in the sense that the landscape and clans are free fantasy although
leaned to medivial japanese habits.
Tales of the Otori1. Across the Nightingale Floor (2002)
2. Grass for His Pillow (2003)
3. Brilliance of the Moon (2004)
4. The Harsh Cry of the Heron (2006)
5. Heaven's Net is Wide (2007) (seems to take place in the time befor "Across the Nightinggale Floor"