The author Hiromu Arakawa integrated several social problems into the story after talking to people who had suffered and lived through them, such as refugees, war veterans and former yakuza, or simply by watching news concerning those issues.
Autorica Hiromu Arakawa u priču je ugradila elemente brojnih društvenih problema o kojima je pričala s ljudima koji su bili njima zahvaćeni, kao npr. izbjeglice, ratni veterani i bivše yakuze ili jednostavno praćenjem vijesti koje su adresirale te probleme.