Pop Princess!

The girls are off to Asia, to perform a concert for the birthday and the coronation of the Princess of Laoba, a small country that has a very traditional and medieval way of life. The Prime Minister of Laoba, Yasamu, invited K3 as a surprise gift for the Princess, since she's a huge fan. Yasamu shows the girls a precious jewel, the "Eternal Rose", which Princess Masako must wear at all costs during her coronation in order to be proclaimed the ruler of the kingdom. But suddenly an alarm is sounded and they discover the diamond was stolen! Yasamu is very quick to accuse X and K3, imprisoning them in the castle's dungeon. Will K3 be able to escape and find out who really stole the precious jewel? Or will these pop princesses be stuck in the middle-ages forever!