A documentary investigating the truth behind the High Treason Incident of 1910, in which socialists and anarchists, including Shūsui Kōtoku, were arrested and sentenced to death or imprisonment amid the Meiji government's suppression of political thought. Through historical documents and personal belongings left by the victims, including a letter written with a needle by the executed women's rights activist Sugako Kanno, the film explores their beliefs and experiences. It also examines the limited responses of Japanese literary figures to the incident, comparing them with reactions to the Dreyfus Affair in France, and follows the continuing efforts to uncover the truth and restore the victims' reputations.