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.
Then why did you go on 
a date with me today?
¿Entonces por qué saliste conmigo hoy?
¿Entonces por qué has salido conmigo hoy?
Então por que você saiu comigo hoje?