Saintess Beryl, who must identify the demon among the three families possessing inhuman power and influence. Only her divine power can reveal who the demon truly is. "Who will you marry?" To escape from the two previous hellish lives, Beryl chooses Duke Vine, who is the real demon. She does this to survive and possibly exact cruel revenge on those who killed her. Thus, Beryl enters the demon's castle. Having learned only how to restrain her desires at the temple, Beryl now learns from the unholy and tempting demon Vine how to truly desire...!