Ashley, scorned as the “useless Saint,” devoted herself to becoming useful with the sword—the one thing she excelled at. One day, her younger brother is abducted by a rival nation and left on the verge of death. Desperate to save him, Ashley’s wish awakens her powers as a Saint, but the strain leaves her completely drained of magic, and she collapses. When she awakens, she feels a sweet surge of magic—only to realize it came from a kiss by Prince Leonard, the crown prince of the enemy nation. To save her brother, Ashley sets her sights on becoming a Grand Saint. Meanwhile, Leonard seeks to gain the Saint for himself. The two strike a deal. The kisses that replenish her magic are sweet... and before long, they begin to turn into kisses filled with deep affection.