Ashley was scorned as a “useless saintess.” One day, as she strived to be useful with the sword she was skilled in, her younger brother was abducted by a hostile neighboring country and left on the brink of death.

"I have to save him!"

With that desperate wish, Ashley awakens the true power of a saintess—but collapses from magical exhaustion.

When she wakes up, enveloped in a sweet magical aura, she realizes it was the enemy crown prince, Leonard, who revived her… with a kiss.

Ashley becomes a great saintess to save her brother, and Leonard seeks to gain her for himself. The two form an alliance. What begins as magical replenishment through kisses slowly turns into kisses of affection and overwhelming devotion…

https://www.cmoa.jp/title/297583/