Chainsaw Man / チェンソーマン is a 20-book series with 20 released primary works first released in 2016 with contributions by Tatsuki Fujimoto and Sakaku Hishikawa.
Chainsaw Man follows the story of Denji, an impoverished teenager who makes a contract that fuses his body with that of a dog-like Devil named Pochita, granting him the ability to transform parts of his body into chainsaws. Denji eventually joins the Public Safety Devil Hunters, a government agency focused on fighting against Devils whenever they become a threat to Japan. The second arc of the story focuses on Asa Mitaka, a high school student who enters into a contract with Yoru, the War Devil, who forces her to hunt down Chainsaw Man in order to reclaim what he had stolen from her.