When tempers flare between Sergeant-Major Mao and Captain Testarossa, there's only one way to settle the score: an AS duel. The stakes are high, the price of failure a fate worse than death; a lap around the track on the Mithrill base naked! However, the summer fun grinds to a halt when Sousuke is called away for a top-secret mission at his old stomping ground where painful memories threaten to bury him alongside his fallen comrades. Will he make it out alive?
Don't miss a minute of the non-stop action that charges forward with both barrels blazing in the fourth volume of Full Metal Panic!