This is the star training school "Holy Class Academy". In this strongest girls' school on the surface, the top girls hold a drink in their hands, which is the class milk produced by the dream cow "Class Cow". A sip will make you shine and move, and the cases are endless like snowflakes. Only at the top of the pyramid can you admire the divine water. To get it, you must win the school duel. This year's duel is: the most personal expression Rap Battle! This is a story of the four students at the bottom of the star training high school, who met because of the Rap Battle and staggered to the top!