If you cannot find the Tekkonkinkreet specific book, look for Taiyo Matsumoto: Art Book "100" . It contains about 20 pages of Tekkonkinkreet production art, plus art from Ping Pong and Go Go Monster . It is still in print and widely available as a PDF via art schools' library subscriptions (JSTOR/Artstor).
Contains early art boards and storyboards by art director Shinji Kimura. White Side (Shiro): Construction Site
Tekkonkinkreet art book collection is a definitive resource for fans of the 2006 Studio 4°C film and Taiyō Matsumoto's original manga. While unofficial PDF versions of these books often circulate online, they typically represent digital scans of four distinct official physical volumes, each focusing on a different stage of the movie's production. The Core Art Book Volumes The most famous parts of the collection are the "Kuro" (Black)
The irony of Tekkonkinkreet is that it is a story about the permanence of place (Treasure Town always rebuilds itself). The art book is that place. A fleeting, pirated PDF is just a ghost. The real magic requires holding the weight of the paper, tracing the ink lines with your finger, and watching the city breathe.