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.
When magical power is too great, 
it will affect the world itself.
Si el poder mágico es muy poderoso 
podría afectar el mundo.
Cuando el poder mágico es demasiado poderoso afecta al mundo en sí.
Um poder mágico muito
 grande afeta o mundo.