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. 
"Don't repay goodness with evil!"
Urashima gritó: "¡No retribuyas 
mi bondad con maldad!".
Urashima gritó: "No hagas el mal a quien te hace el bien".
"Não pague a bondade
 fazendo o mal!".