ShamoShamo.

Shamo (Japanese: 軍鶏; lit. 'Gamecock') is a Japanese manga series written by Akio Tanaka and Izo Hashimoto and illustrated by Tanaka. It was first serialized in Futabasha's seinen manga magazine Weekly Manga Action from 1998 to 2003, before transferring to Kodansha's seinen manga magazine Evening in 2004. It was discontinued in 2007 due to creative differences but returned in 2011, concluding serialization in 2015.