About the manga:
Set in: a big city probably in Europe. Most of the buildings that appear in the manga are existing buildings somewhere in Hungary or in other European cities.
Versions: you can read here the 3rd version of PW.
The 1st version was created ten years ago and was not published. The 2nd version was uploaded some years ago here. The 3rd version is the newest. I have been using Photoshop for the 3rd version.
The storyline was not changed, only little modifications were made which was necessary to understand the story and the relationships between the characters better.
Books: the manga consist of 2 books (6-7 chapters in each book). The 3rd version is not completely ready.
Hope you will have fun :)