Remy, the "weakest court magician" who can only use the magic of "brewing delicious black tea." However, her true ability is that 'as long as there is black tea, it can be transformed into a black tea sword that cuts through anything, or a universal medicine that heals everything!' Her wish is to live inconspicuously as a window-side person. But, unknowingly, she gets caught up in conspiracies happening in the court and is adored by an innocent princess... What will happen to her dream of a window-side life!?