Hayate is forced into a situation his only viable option is to do something illegal, unethical, and unbecoming.  After being called a Mom like figure to Nagi, Maria goes to the source on information regarding Nagi’s father.
I've lost all faith in you, big sister!
¡He perdido mi fe en ti, hermana!
¡He perdido mi fe en ti, hermana!
Eu julguei mal você, mana!