What did the Star Academy mainly talk about? Ask for references.

The Phantom Star Academy, which stands in the center of Rilla Kingdom, is the dream place of all children, and our story takes place in this Phantom Star Academy. Mei Xing, the daughter of the exorcist Morikawa, met Xiaoyue, Philo, Beilin and Zhijiang, and became good friends who studied and lived together. Suddenly, one day, the heart stone, a powerful magical treasure given by the fairies of the ancient twelve constellations, which was preserved in the college, disappeared with the exorcist, the father of American stars. In order to find the heart stone and return his father's innocence, Meixing and her friends embarked on the road of searching.