After Hayate stated that if anyone defeats him will get the Sanzenin estate, Hayate decides to quit being Nagi's butler!
Now, become a butler who 
serves us body and soul!
¡Vamos, conviértete en un mayordomo 
que nos sirva en cuerpo y alma!
Vamos lá, torne-se um mordomo
que nos serve de corpo e alma!