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. 
Tell me what your agenda is.
deberías decirme cuál 
es tu objetivo de una vez.
dime de una vez qué pintas tú aquí...
Me diga qual é o seu objetivo.