Full Metal Panic! Short Stories Volume 5: Unquenchable Five-Alarm Fire?

Sagara Sousuke might no longer be a mercenary, but there are still times when he's called in to solve problems. With the endless support (and occasional fury) of Chidori Kaname spurring him on, he'll negotiate peace between playground warring factions, fight a martial arts duel for control of a dojo, and lead a yakuza turf war-with mascot suits! But whether he has to track down a missing handbag (possibly full of biological weapons) or compete for the approval of a convalescing custodian, there's no blaze that firefighter Sousuke can't extinguish!