The deal was to get 5 new members for the Karuta club.  Chihaya has to figure out a way to keep the room and deal with the band club.
Tell him that we recruited 
twenty, if only for a moment!
¡Dile que reclutamos veinte 
aunque fuera un momento!
¡Dile que reclutamos veinte 
aunque fuera por un momento!
Diga que recrutamos 20,
 mesmo que por pouco tempo!