Taieki Mahou Kishi wa Henkyou de Yadoya wo Eigyouchuu

A royal magic knight who was called the "White Devil" and feared on the battlefield retired due to injuries sustained while protecting the crown prince. She began living on the frontier far from the royal capital. The second slow life of a retired magic knight who became the hostess of an inn famous for its cooking. Things change when a large man and his attendants visit... Source: MU