Hayate cannot bring himself to return to the Sanzenin mansion after he damages the cashmere coat that Maria lent him. While contemplating on what to do, he meets the "generous" people who tried to take him away and ends up fighting them all!
To live up to the mistress's expectations! 
That is what a butler does!
¡Cumplir con las expectativas de su señora! 
¡Esa es la labor de un mayordomo!