Tekkon Kinkreet (鉄コン筋クリート, Tekkon Kinkurīto?, a pun on "Tekkin Concrete", the Japanese term for reinforced concrete) (also known as Tekkonkinkreet in English release) is a 2006 feature-length Japanese anime film, directed by Michael Arias and animated by Studio 4°C, adapted from Black and White, a three-volume seinen manga series by Taiyō Matsumoto, which was originally serialized between 1993 and 1994 in Shogakukan's Big Comic Spirits. It was first released in Japan on December 23, 2006. The story takes place in the fictional Treasure Town and centers on a pair of orphaned street kids: the tough, canny Black and the childish, snot-nosed White, together known as the Cats, as they deal with yakuza attempting to take over Takara Machi.

Source: Wikipedia