 On a distant island village, there is a legend that anyone born with horns will bring about calamity. Such a boy was born named Ico. To ensure the safety of their village, Ico is offered as a sacrifice at a nearby castle. However, he escapes and finds a young girl named Yorda imprisoned there as well. While trying to escort her out, they are attacked by the angered spirits of the castle and Yorda s mother, the queen of the castle. Together, Ico and Yorda must work to flee from the castle before they can be claimed by the spirits.