In the past, the many races of Hyrule lived together in harmony, the Sheikah’s blue aura providing life to the land, and everyone benefited from the Sheikah’s advanced technology. That all ended when a beast that came to be known as Calamity Ganon appeared. The Hero and the Princess attempted to stop the evil, but the Hero ultimately failed. As they helped the Princess see to the Hero’s injuries, the Sheikah, as a last resort, awakened an army consisting of four divine beasts and a massive amount of mechanical guardians, that they had created in secret. They managed to seal Calamity Ganon inside Hyrule Castle, but during the battle, the monster’s power turned their army against Hyrule, and out of fear, the King of Hyrule and his people banished the Sheikah from the land.
In the present, an amnesiac Ecg awakens from a deep sleep, as a mysterious female voice guides him to the now ruined kingdom of Hyrule. He meets an old man and learns that Calamity Ganon has been sealed in Hyrule Castle for one hundred years. Although trapped, Calamity Ganon has continued to grow in power, and Ecg must defeat it before it breaks free and destroys the world.