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.
Those whose souls are bound by a 
pact are able to sense each other.
Jene, dessen Seelen durch einen Pakt
verbunden sind, können sich spüren.
Las almas que establecen un 
pacto pueden sentirse entre sí.
Las almas que establecen 
un pacto pueden sentirse entre sí.
Deux êtres liés spirituellement peuvent
sentir mutuellement leur présence.
Le persone legate da un contratto
sono in grado di percepirsi reciprocamente.
Aqueles que têm suas almas ligadas através
 de um pacto podem sentir um ao outro.
Связанные договором души 
могут чувствовать друг друга.