At the turn of the 20th century, thousands of poor Japanese girls were tricked or kidnapped by zegen - Japanese "impresarios". The girls were smuggled onto steamships and sent to Singapore, where they were sold for sex to a largely male population while the British authorities struggled to contain prostitution and disease. In 1906, a young magistrate in Nagasaki meets the son of a prostitute, who tells him an incredible story of human trafficking...