After a fight Hayate, Nagi heads to the apartment complex to hang out.  But her “little sister” is the only one home.  This might be Nagi’s chance to find out what Ruri’s real goal is. 
So that means no one is home.
Así que no hay nadie en casa.
Entonces no hay nadie en todo el edificio...
Isso significa que não 
tem ninguém aqui agora.