Translated from the Japanese.
"This book is printed manga-style in the authentic Japanese right-to-left format"--Colophon.
"First published in Japan in 2001 Sobisha Inc."--Vol. 1, t.p. verso.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Diabolo by Kei Kusunoki. ISBN 9781595325945. Published by Tokyopop in 2004. Publication and catalogue information, links to buy online and reader comments.
