Best friends forever

Lucie and Ema have been best friends since the second grade. But after returning from the holidays, Lucie accidentally starts a new button fashion that gradually engulfs the whole school. They all exchange buttons, talk about nothing but buttons and Lucie becomes a star. And this is a test not only for Emma, who is used to being in the spotlight all the time, but also for girl friendship as such. Will the girls split up completely, or will they find their way back together?