(Japanese: メイドインアビス Hepburn: Meido in Abisu) is a Japanese manga series by Akihito Tsukushi and published by Takeshobo. It has been serialized online in Takeshobo’s digital publication Web Comic Gamma since 2012 and has been collected into seven tankōbon volumes. An anime television series adaptation by Kinema Citrus aired its first season from July 7 to September 29, 2017, and a sequel film will premiere on January 17, 2020.The enormous cave system, known as the Abyss, is the only unexplored place in the world. Nobody knows how deep down goes this titanic pit, inhabited by strange and wondrous creatures and full of mysterious ancient relics which purpose in unknown to modern man. Generations of bold adventurers have been drawn by the cryptic depths of the Abyss. In course of time those bold enough to explore the dangerous pit came to be known as “Cave Raiders.