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. 
There's nothing I can do about it!
¡No puedo hacer nada al respecto!
¡Pues no puedo hacer nada!
Não posso fazer nada.