Based on the first three volumes of the novel and the upcoming second volume of the manga adaptation. Alta Schweitzer, a boy possessing the memories of Raoul Izalv, the renowned Sword Saint, serves the kingdom as its youngest knight. Having endured a life of constant battles in his past life, Alta desires a fulfilling and easy life in his new life. He plans to work hard and retire early. His assigned task? Protecting the kingdom's strongest warrior, the Sword Saint Princess.