Yurei is the Japanese word for "ghost." It's as simple as that. They are the souls of dead people, unable - or unwilling - to shuffle off this mortal coil. Yurei are many things, but "friendly" isn't the first word that comes to mind. Not every yurei is dangerous, but they are all driven by emotions so uncontrollably powerful that they have taken on a life of their own: rage, sadness, devotion, a desire for revenge, or even the firm belief that they are still alive.
This book, the third in Attack! series, gives detailed information on 39 of the creepiest yurei stalking Japan, along with detailed histories and defensive tactics should you have the misfortune to encounter one.
Oiwa, The Horror of Yotsuya
Otsuyu, The Tale of the Peony Lantern
The Lady Rokujo, The Tale of Genji
Isora, Tales of Moonlight and Rain
Orui, The Depths of Kasane
Written by Hiroko Yoda & Matt Alt and Illustrated by Shinkichi Shinkichi.