People called the place where the scent of the seasons and the wind begin, Yuanquanjiang. There, a girl who lived with a dragon pearl and a large crane named 'Ya' was violently kidnapped by intruders on a dark night. The ship was wrecked, and the girl ended up alone on an unknown island. To return to the happy Yuanquanjiang, the girl successively meets a girl who has read 400,000 books, a boy who carries a rain cloud above his head, and an imugi that cannot ascend to the sky no matter how many dragon pearls it collects.