My first book "窓(SOU)" is published from Little Big Man publisher.
http://littlebigmanbooks.com/collections/books/products/koji-takiguchi-sou

【出版社】Little Big Man 2014年 Limited edition of 300 copies.
【題字】Araki, Nobuyoshi（荒木経惟）
【装丁】Softcover（ソフトカバー）
【ページ】120 pages with col. illus.
【サイズ】33 x 23 cm

You can directly buy it at these online shop.
The toal copies are limited 300 copies.
I think japanese total are about "80 copies".

Japan:
Flotsam Books:
http://www.flotsambooks.com/SHOP/PH01843.html
(This shop distributes this book"窓” to Japan)

So Books:
http://sobooks.jp/books/28757

Daikanyama Tsutaya T-site:
Tsutaya Daikanyama:https://daikanyama-ec.tsite.jp/tsutaya/475/35478/

New York:
Dashwood books:
http://www.dashwoodbooks.com/pages/books/14783/koji-takiguchi/sou

Please chack it out.

僕のファースト写真集「窓-SOU-」が日本で発売が開始されています。
上記の書店で直接オンラインで購入出来ます。