It's the night before the Mai High Festival.  Keima and Chihiro are alone on the roof of the school.  Chihiro seems confused by Keima's behavior, but he continues with his conquest.  But as Keima makes his move, Chihiro says something unexpected.
It wouldn't do for them to 
be trapped by the barrier.
No les serviría quedar 
atrapados en la barrera
No les serviría de nada quedarse 
atrapados en la barrera
Eles não seriam presos por ela.