Full Metal Panic? Fumoffu (2003 - 2003)

Sergeant Sousuke Sagara appears at school disguised as an ordinary young man. His mission is to protect Kaname Chidori from any threats. However, Sousuke, who was raised as a true warrior, completely lacks basic social skills and real-life experience. He has only seen war. Due to his antisocial behavior, Sousuke finds himself in numerous comical situations. As a result, Kaname's peaceful school life quickly turns into a real nightmare.