Akagi: Yami ni Oritatta Tensai is a Japanese manga series written and illustrated by Nobuyuki Fukumoto. First published in 1991 in Takeshobo's weekly magazine Kindai Mahjong, it is a spin-off prequel of the author's previous work, Ten. It revolves around Shigeru Akagi, a boy who defeats yakuza members well versed in mahjong at 13. He returns to the game six years later, carrying a mythical status and still impresses his opponents.

Nobuyuki Fukumoto is a Japanese manga artist, well known for his work including unique and original gambling ideas, deep psychological analyses of characters, and his distinct art style. Gambling and yakuza are recurring themes in his manga. In English-speaking countries, he is best known as the author of Kaiji, a gambling-related manga, and Akagi, a mahjong-related manga. In 1998, he won the Kodansha Manga Award for Gambling Apocalypse: Kaiji. An onomatopoeia, "zawa", meaning an uneasy atmosphere, frequently appears in his comics and is considered his trademark.