Kenka Shōbai (喧嘩商売, "Fighting Business") is a Japanese manga series written and illustrated by Yasuaki Kita.

[2][3] Twenty four volumes compiling the chapters were published between 2005 and 2011.

[4] Kenka Kagyō (喧嘩稼業), a related series by the same author, is published in the same magazine since December 9, 2013, and thirteen volumes compiling the chapters have been released so far.

[5][6] The series follows the adventures of Jubei Sato, a high school student who transferred from Tokyo to a high school in Utsunomiya, and gets involved in a life of fighting.

Sato, who is extremely self-centered, narcissistic, boisterous, and irreverent, happens to be a genius at fighting, who does not hesitate to use any means necessary to win, often using various schemes to gain an advantage over his opponents.