When a colossal force of nature named Yrso awakens from its ancient slumber, young Erin is called to it. The Giant reveals that it has been safeguarding Erin for her entire life. But now, Erin must protect Yrso-and the rest of the natural world-by joining together in a special kind of harmony. But an evil corporation has its sight set on using the Giants as weapons, and not all of the Giants have Earth's best interests at heart...
