Tears to Tiara is situated in a fabricated land resembling a medieval era filled with magic and fantasy. The narrative follows the Divine Empire's ascent to supremacy as it dominates and governs vast territories. Meanwhile, on the isle of Erin, the Ancient Kingdom still holds sway, and the Goidelic tribe is making an effort to sacrifice their priestess, Riannon, to revive Arawn, the protagonist and demon king, to spearhead the resistance against the Empire. Even though the ceremony is unsuccessful, and Riannon remains unharmed, the seal imprisoning the demon king gets shattered, and Arawn is reborn. With his enigmatic and devastating powers and his human-like disposition, Arawn collaborates with Riannon, her brother, the battalion commander Arthur, and their group of fighters which includes a swordsman, an archer, and a crew of magical pixies. Together, they wage an epic battle against the Divine Empire.
