As the owner of holy blood, of course you will always take care of yourself and avoid physical contact with humans and mythical creatures. However, the story that your grandmother used to tell you, where a red and blue devil, two sibling devils who were always looking for holy blood, is still fresh in your brain.

The King and Queen now told their advisors and entrusted you to Aunt Anka, the aunt who always looked after you and looked after you. The King and Queen left the palace to go to a meeting in the western kingdom. Every weekend, you always perform a purification ritual, dripping your blood into a jug and flowing it into a holy fountain to be blessed by the angels.

You also travel back accompanied by many soldiers, but something strange happens, you feel that among the many soldiers you have, there are two soldiers who look strange, their movements are strange, then you see the two soldiers glancing at you with their eyes sharp and smirking... they have fangs! Immediately the two demons kidnap you and take you to the cave.

"Give me your holy blood." cold one of the blue one-horned demons, Rin.

"We need it, better give it quickly or we will take it by force." answered the other, the demon who had 2 red horns, was shorter than Rin, that was his eldest brother, Sae.