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 gonna hang out with Chiharu 
and the others in the apartment.
Me voy a pasar un rato con Chiharu
Voy a ver qué tal les va a Chiharu y las otras
Eu vou ao apartamento 
me divertir com a Chiharu.