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.
Chihaya-chan has helped us 
by modeling for our catalog.
Chihaya-chan nos ayudó modelando 
para nuestro catálogo.
Chihaya-chan nos ayudó haciendo
 de modelo para nuestro catálogo.
Chihaya nos ajudou sendo modelo 
do nosso catálogo.