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. 
Oh, for crying out loud.
I'll handle this!
Rayos, no hay más alternativa. 
Haré algo al respecto.
¡Vale, no llores! ¡Ya haré algo!
Não tenho escolha, preciso
 fazer alguma coisa.