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 guess the people after Mio couldn't 
infiltrate the school and make any bold moves.
Mios Verfolger könnten also nicht die Schule
belagern und einen kühnen Schachzug wagen.
Donc même si un ennemi
s’infiltre à l’école,
Suppongo che gli inseguitori di Mio non possano
infiltrarsi a scuola e fare mosse strane.
Imagino que as pessoas atrás da Mio
não puderam infiltrar na escola
Попробуй кто напасть на Мио
в школе, особо разгуляться у него не получится.