Full Metal Panic!

Kaname Chidori is one of the most popular girls at her high school, but her real problems lie beyond campus. Without her knowledge, terrorists are targeting her, convinced she has the rare abilities of "the Whispered." Enter Sousuke Sagara, a skilled soldier from the secretive counter-terrorist group Mithril, assigned to protect her by posing as a student. While he’s a natural in an Arm Slave mech, navigating the chaos of high school might be his toughest mission yet.