Mizuki is a half-blood. She is half Pandagirl and half demon. Even as a child, Mizuki was considered a monster by the people of ancient Japan and was shunned. As she grew older, her demonic abilities grew as well, which is why she was persecuted and constantly attacked by the landlords of ancient Japan.
She was given the name Mizuki the Bloodthirsty because no one could harm her. Actually, her greatest wish is to live together with the people in peace and to form friendships.
But the humans gave her no choice but to fight against them to protect her own life.