Guts, "The Black Swordsman", is pursued by demons who are attracted to him, due to a demonic brand on his neck. His goal is to free himself, and his lover Casca, of this inescapable curse. His other life's goal is gain vengeance on his former best friend Griffith, who doomed him and his former Band of Mercenaries, to obtain demonic powers of his own. Gut's giant "Dragon Slayer" sword, the Elf Puck and a growing band of misfit companion aid him in his quest for vengeance.