ルビーvsエメラルドvsダイヤモンドガール! 誰が一番強いのか？

On their first day of school, BB Emerald (poor), Tina Ruby (rich), and Rose Diamond (ultra-rich) meet at the lockers, but Tina and Rose show their dislike for BB. Upon entering the classroom, they find their desks covered in dust and decide to clean and decorate them in their respective signature gemstone styles. Later, the teacher hands out a test; unable to solve the questions, Tina and Rose try to cheat in their own ways but are caught red-handed and given an F, while the studious BB works independently and earns an A+. Seeing them upset after the teacher leaves, BB kindly steps in to help them study. The next day, all three retake the test, successfully score an A+, and joyfully celebrate together.