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. 
If they flood, we'll have big trouble.
Estaremos en aprietos si se inunda.
no vaya a ser que se inunden.
Vai ser um problemão
 se entrar água!