Ico is a young boy born with horns which in his village is considered a bad omen and a curse. Because of this he was locked in a casket and left to die within a castle-like fortress. After managing to escape the casket he encounters Yorda the daughter of the Queen of the castle who intends to prolong her life by taking Yorda’s body. Ico frees Yorda from her cage and despite speaking entirely different languages manage to overcome the language barrier and assist each other.
Being timid and rather fragile Yorda trusts Ico and allows him to take her by the hand as they both attempt to escape the castle while continuously being perused by shadowy figures sent to retrieve Yorda. Yorda possesses the ability to move the idols that block the doorways similar to the Queens Blade and Ico protects, guides/helps Yorda across obstacles, and when given the chance to escape while Yorda is injured refuses to leave her behind.
After opening the main gates Yorda is left badly injured with the shadowy figures closing in but saves Ico by grabbing his hand, preventing him from falling. Yorda is then turned to stone and heavily guarded by the shadowy figures. Ico confronts the Witch and is victorious but knocked unconscious, breaking both his horns just as the castle starts to collapse. Yorda awakes as a shadowy figure and again saves Ico by putting him in a boat. Ico later finds Yorda’s body washed up on the beach just as she opens her eyes.