The Bebaus brothers are advancing their fleet but do not have enough ambassadors for their conquered territories. Thus, Lafiel is assigned the role of Territorial Ambassador for Lobnas II. Upon arrival, they discover that the planet was formerly a United Mankind prison with one million prisoners on the inhabited island. The prisoners are split into three blocks with the women in the west, the men in the east, and a central section reserved for sterilized prisoners. The women aim to escape the planet due to fear of the men, which provokes the men to rebel and take Jinto captive to stop the women's escape. To make matters worse, a hostile fleet is approaching, and Lafiel must leave Jinto behind.