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. 
I'm your cute little sister!
- Soy tu linda hermana menor.
Soy tu preciosísima hermana pequeña.
Eu sou sua linda irmãzinha!