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.
Still, getting in was too easy.
Pero fue muy sencillo entrar.
Pero ha sido muy sencillo entrar.
Mesmo assim, entrar foi fácil demais.