Dozens of Mongolians protested the “barbaric act” outside Shogakukan Inc.’s headquarters in Tokyo earlier this week, reportedly shouting: “Insulting Genghis Khan is unforgivable!”

The publisher has already apologised for the offending cartoon in the March issue of popular manga Gekkan Corocoro, but protesters are demanding that the comic be recalled from all stores.

The publisher told The Asahi Shimbun it “would like to offer our deepest apologies to Mongolians and everyone else who esteem Genghis Khan and were disgusted by the inappropriate expression”.