Tokyo Department Store Wars Chronicles

Tokyo Department Store Wars Chronicles is a oneshot shounen action and comedy manga written by Matsui Yuusei and published in 2011 by Shueisha in JUMP magazine.

Setting
The story takes place in a desolate wasteland-version of Tokyo where resources are hard to come by, but within the center of the land lies a gigantic Department Store where countless riches can be found, however these treasures are all under the protection of vicious bio-mechanical creatures known as Mannequins and all those seeking their treasures must submit payment to them, the price being their lives. The only ones capable of slaying these monstrosities and retrieving their merchandise are powerful men known as Wild Merchants.