Yu asks his friends if they are free on Christmas Eve. The girls are under the impression that Yu is asking for a date. How will things prevail?
But if that were to happen...
"لو حصل هذا"
Aber wenn das passiert ...
Si eso ocurriera, ¿Narukami-kun 
se encargaría de la posada?
Si eso ocurriera, ¿Narukami-kun 
se encargaría de la posada?
Mas se isso acontecesse...