As far as now, Raphael Lockwood, a mixed-blood witch—a human and a witch—has relied on the potions created by his father to live, which unfortunately began to lose their effectiveness. While he is worried about the state of his body, Isaac Kanon, his childhood friend and ruler of the kingdom he lives in, confesses his love to him, which he has to reject due to his condition.
Isaac is a human, and he does not willing to give up his feeling to Raphael even when Raphael rejected his feeling. But Raphael's condition begins to worse so he forced to agree with the term that a dragon—Daniel Krauss, offered to him to help cure Raphael's curse. The payment for his request is he has to give up Raphael to be Daniel's fiance for a month. Will Isaac be able to get Raphael back to his side?