Akai Kiba is an anthology doujinshi, published between 2002 and 2014. It featured many one-shots from Tsutomu Nihei and other famous mangaka (such as the author of Bokurano, No Longer Human, Blade of the Immortal and Dorohedoro). The anthology spanned 9 total volumes and was sold at the Comiket.

The spinoff manga centers on the meals of the Namerikawa yakuza group led by Hidenobu Namerikawa, his sworn younger brothers Kajio and Tobita, and their apprentice Chūbō. What do they eat in their peaceful yakuza days, and what do they eat in tense situations? (Source: Anime News Network)