Ria is the second daughter of Count Garfield and she grew up being tyrannized by her older sister, Priscilla. This was until she was appointed the nation's guardian saint at 15 years old and subsequently made the crown prince's fiancée.

Just when she thought that she was about to start a happier life, that's when she was given the order to subjugate monsters as the nation's guardian saint. After finally managing to seal all the monsters and returning home for the first time in two years, she found herself betrayed by her fiancé and older sister and is now exiled from the country.

At the forest she was banished to, Ria had given up all hope and had even come to accept her impending death but a chance meeting there with a handsome young man has brought about a total change to her fate...!
護国聖女のリアは、幼い頃から姉のプリシラに虐げられ続けてきた。
つらい毎日に耐えながら、聖女の力で国民を治療し、魔物と戦い、懸命に国に尽くしてきたリア。
しかしある日、姉と婚約者の裏切りによって国外へと追放されてしまう。
失意の底で森を彷徨い、自分の死すら受け入れたリアだったが、そこで偶然助けた青年は隣国の王子様だった！　
その出会いからリアの運命は一変し――！