Tekkonkinkreet (鉄コン筋クリート, Tekkonkinkurīto, a child's mispronunciation of "Tekkin Konkurito" [steel reinforced concrete]) is a three-volume seinen manga series by Taiyō Matsumoto, which was originally serialized from 1993 to 1994 in Shogakukan's Big Comic Spirits and first published in English as Tekkonkinkreet: Black & White. It was adapted into a 2006 feature-length Japanese anime film of the same name, directed by Michael Arias and animated by Studio 4°C.