Tears to Tiara is set in a world based on British, Celtic & Roman mythology during the Dark Ages. The demon lord Arawn, has been resurrected since his death a millennium ago by Drwc, a priest from the Divine Empire, who plans to rule the world using Arwan's powers by offering a girl named Riannon, a descendant of the Elf King Pwyll as a sacrifice. However, Arawn refuses the sacrifice and kills Drwc instead. Grateful for saving her, Riannon makes him her husband and Chief of her people, the Gael Tribe. Together with Arthur, Riannon's older brother and the tribe's First Warrior and Ogam, a wizard and an old friend of Arawn and the siblings, Arawn leads the tribe along with a group of warriors who follow them against the Empire who plans to destroy all those who oppose them.