Umarekawatta <Kensei> wa Raku wo Shitai

Alta Schweiz is a boy who remembers his past life and is now the youngest knight in the kingdom. Formerly known as Raul Isaulf, he spent his previous life constantly at war. Now, he prefers to work hard but hopes to retire early and live a peaceful and satisfying life in this new existence. One of his assigned duties is to accompany the "Princess of the Kingdom," who is acknowledged as the strongest person in the realm.