As daughter of the former demon lord, Mio's foster parents were slain by powerful demons after her life. Still seeking to slay her, Basara reveals himself as a member of the hero clan--an enemy of the demons--and vows to protect Mio as a member of his family.
I'm Sakazaki Mamoru, the one 
in charge of your class.
Ich bin Sakazaki Mamoru,
dein Klassenlehrer.
Soy Mamoru Sakazaki, 
estoy a cargo de tu clase.
Soy Mamoru Sakazaki, 
estoy a cargo de tu clase.
Je suis Mamoru Sakazaki,
ton prof principal.
Sono Sakazaki Mamoru,
il responsabile in carica per la tua classe.
Eu sou Sakazaki Mamoru, o professor
 responsável pela sua turma.
Я твой классный руководитель, 
Мамору Сакадзаки.