It's the first day of the new school year. 5th grader Ari and her best friends Suha and Min have started an after-school activity called the problem-solving club. However, no one seems to have any problems that need to be solved. Disappointed Ari ends up discovering an unconscious hamster on the road. Amazingly...the hamster begins to speak. "I must find the magic ring..."

Ari has become a teacher?! Tubby, the hamster, has come from the World of Magic and he explains that Ari has transformed into an adult because of her sincere wish to help her troubled homeroom teacher. In order to do this, Ari pretends to sit in and observe her class, but ends up having to teach it herself! Will she be able to pull it off?

With the power of magic at their disposal, Ari and her friends think they can solve everyone's problems easier. Then one day, the show 'Pop Music Now' comes to broadcast live at the outdoor stage beside their school. While rehearsing, pop star legend Lyla starts to emit Hopeless Energy which attracts Trump and Mao. Eventually, Tubby and Trump run into each other...

Lyla has disappeared. Ari and her friends go look for her. Their sincere wish to help her makes the magic ring react and both Suha and Min end up with magic rings of their own as well. Through the power of magic, the girls have transformed into pop singers. Will they be able to save Lyla from the grips of despair?