Gamaran.

我間乱〜GAMARAN〜

Gamaran (我間乱; 'Gama's Uprising') is a Japanese manga series written and illustrated by Yousuke Nakamaru. It was serialized in Kodansha's shōnenmanga magazine Weekly Shōnen Magazine from May 2009 to June 2013, with its chapters collected in twenty-two tankōbon volumes. The series chronicles the adventures of Gama Kurogane as he competes in the Grand Tournament of Unabara.