What is "un-go"

is a 2011 anime television series produced by Bones which aired on Fuji TV's noitamina program block between October 13, 2011 and December 22, 2011. Based on the noted Japanese intellectual and novelist Ango Sakaguchi's novel , the series is directed by Seiji Mizushima and written by Shō Aikawa, who had earlier worked together on Fullmetal Alchemist. Featuring character designs from pako and Yun Kouga, the music for the series is composed by NARASAKI, with the opening theme being "How to Go" by School Food Punishment and the ending theme being "Fantasy" by LAMA.

Un-Go was simulcast with English subtitles by Crunchyroll and Anime on Demand. A prequel film, , ran in Japanese theatres for two weeks from November 19, 2011. Sentai Filmworks has licensed the series, along with episode 0, in North America, while Siren Visual has licensed the series in Australia and Manga Entertainment has licensed the series in the United Kingdom.