A manga titled Nippon Sangoku explores the possibility of achieving peace through speech. The story follows a young man on a mission to unify a land torn apart by rival fiefdoms.

This manga is set in a near-future world where global civilization has collapsed. The protagonist attempts to bring peace to the land using his intelligence and speaking abilities, rather than resorting to violence.

Further details about the manga Nippon Sangoku can be found through the source, which provides more information about this story and its themes.