Sacrificial Princess and the King of Beasts

Sariphi, a girl offered to the demon king as the 99th sacrifice. However, she accepts her fate and decides to approach the king without fear. On the night of the new moon, Sariphi heads to the sacrificial ceremony, but the one there was not a demon, but a king in human form. The demon king, who decided to make Sariphi his queen, was given the name Leonhart by her, and they begin to walk together aiming for coexistence between humans and demons.