The 11-year-old cool girl Guanguan is not an obedient child in her mother’s eyes. She is a unusual girl, loves adventure, and hope to become a “great hero” that attracts the attention of the world. She’s confident and brave, honesty and perseverant. Sometimes, she is selfish, feels coward, loses her temper, and couldn’t help being jealous. She’s not perfect, but definitely unique. One day, Guanguan got an egg and had it hatched. Since then, this unique girl has the world’s unique little T. rex as a pet. Together, they explores in the Pleasant Land City, track down mystery cases, and rescues their friends. They trust each other, are full of love and courage, and while solving one problem after another, they reap precious friendship and growth.