Park Ina, an ordinary office worker who never once escaped the ordinary routine of her life, dies of overwork and is reincarnated as Saint Lilina of the Kingdom of Beyondier, wishing to have sex with handsome men to her heart's content in this lifetime. "If you don't have sex for even a single day, you die! Will you do it?" Under the condition that her life ends if she doesn't have sex every day, she forms different relationships with handsome princes while agonizing over who to choose as the next successor…