Natsume, now trapped in the mansion, is trying to keep the Monkey Mask youkai from revealing the Book of Friends to Matoba. While Hinoe and Misuzu attempt to find the strange youkai’s master.
That youkai is with you because 
he can gain from doing so.
Estás con esos youkai 
porque son convenientes.
Eres amable con los youkai
sólo porque te conviene.
Esse youkai só te protege por puro interesse.