Even after Camio reveals himself, William remains concerned only with his grades and tuition and tries to distance himself from the demons and their political war.  Unfortunately, he soon finds himself roped into another problem when the Headmaster asks him to find the source of a mysterious singing voice that's been disturbing students late at night.
Yes, people singing and making 
a ruckus late at night,
Sí, gente cantando y haciendo 
ruido a altas horas de la noche,
Sí, gente cantando y haciendo 
ruido a altas horas de la noche,
Sim, gente de cantoria e causando
 tumulto na calada da noite,