Tekkonkinkreet (2006)

In the vibrant but precarious urban landscape of Treasure Town, brothers Black and White navigate its contrasting tranquility and turbulence with streetwise ease, treating the urban landscape as their own playground. However, their carefree existence is disrupted when a malevolent force targets them, plunging them into a struggle against the Yakuza and lethal assassins vying for dominance of the metropolis' decadent streets.