The assassin organization operative, Hiumei, stirs up her relationship with Rose by manipulating Kōka, leading them both to a refugee settlement. There, Kōka witnesses the harsh daily lives of refugees who are ruled by <Babylon> and live according to its cold, unyielding rules. Meanwhile, a quiet clash among assassins over the classified information held by Kōka's father, Father Hakuhō, reaches its climax.