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 used my own magic in the pact,
Ich habe meine eigene Magie
in diesem Pakt verwendet,
Como utilicé mi magia en el pacto, 
Mio-sama sufre una maldición de súcubo.
Como utilicé mi magia en el pacto, 
Mio-sama sufre una maldición de súcubo.
Elle a utilisé mes pouvoirs
pour passer le pacte.
Ho usato la mia magia nel contratto,
Eu usei a minha própria 
mágica durante o pacto,
Так как для договора была использована моя 
магия, на госпоже Мио теперь проклятие суккуба.