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. 
What are you talking about, Hayata-kun?
¿De qué hablas, Hayata-kun?
¡¿Pero qué dices, Hayata?!
Do que você está
 falando, Hayata?