Nanbaka (ナンバカ), also known as Nanbaka - The Numbers, is a Japanese manga series written and illustrated by Shō Futamata. An anime television series adaptation by Satelight aired between 5 October 2016 and 22 March 2017. The title is a play on words, combining the name of the prison, which is the Japanese transcription of the word "number", and the Japanese word "baka" for "fool" or "idiot".