Full Metal Panic! Short Stories Volume 6

He may have survived the world’s most dangerous battlefields, but Sagara Sousuke is finding his tenure in high school to be no less intense. In addition to having to master new skills—navigating a romance for a karate-obsessed rival, subbing in as an actor for a tyrannical movie director, drafting a prospective student pamphlet for a special reward—his relationship with Chidori Kaname is becoming more complicated. After he participates in a girl hunt (to help out a friend, of course) and unleashes a biohazard in his homeroom class... if enemy snipers don’t put him in an early grave, Kaname just might!

[From J-Novel Club]