December reveals Ros's secret.  The party is shocked and glad to hear it.  But Ros seems unhappy, and December thinks he knows why.  He says that if Ros uses his power it will revive the Demon King, and so he orders Juli to attack again.
You can't beat Juli-kun with 
the magical power you have now.
No podrás ganarle a Juli-kun con 
el poder mágico que tienes ahora.
No vas a poder ganar a Juli-kun con tu poder mágico actual.
Você não vai conseguir derrotar
 o Juli com seu poder de agora.