Original: As the number of Mamodos decreases, Zatch and his allies encounter a Mamodo called Zofis who takes control of several Mamodos who were sealed in stone from the previous battle to decide the king. After the battle against Zofis, the whole world is put in danger after a giant Mamodo named Faudo is brought to life by a Mamodo named Riou.
Simplified: The last Mamodo standing will be 'King' of the Mamodos.