And you thought the "9" referred to nine people in this ensemble cast? Of course not!
Spoiler: Nine actually referred to the nine minutes the poor spirits' bodies could survive before reviving was impossible.
Nothing is impossible for ghosts, even spreading wings they didn't know they had.
Ryouka passes by a TV reporting on Yuuta's handiwork.
Ryouka intends to wait forever until her Gamo-tan comes back because Ryo-tas is his minion after all.
This show would definitely not have been the same without those Ryo-tatas.