'ink attack') is a Japanese manga adaptation by Hideki Mori of the novel of the same name by Ken'ichi Sakemi.

[2][3] It was adapted in to the 2006 Chinese, Korean, Japanese, and Hong Kong joint film, A Battle of Wits.

About 2,300 years ago, China during the Warring States period, where the seven kingdoms of Han, Wei, Zhao, Qi, Yan, Qin, and Chu.

Zhao had a large army on the border on the other side of the river, ready to attack Liangcheng, a small walled city in Yan.

The lord of Liangcheng asked for help from the Mohists, a group of experts in defending fortified cities, to protect his castle.