It is back-to-school mayhem with Chidori Kaname and her battle-hardened classmate Sagara Sousuke as they encounter more misadventures in and out of Jindai High School. But when Kaname gets into some serious trouble, Sousuke takes the guise of Bonta-kun — the gun-wielding, butt-kicking mascot. And while he struggles to continue living as a normal teenager, Sousuke also has to deal with protecting his superior officer Teletha Testarossa, who has decided to take a vacation from Mithril and spend a couple of weeks as his and Kaname's classmate.

Source: ANN

Note: Because of a then current kidnapping event, TV Tokyo did not broadcast what were supposed to be part 2 of episode 1 (A Hostage with No Compromises) and part 1 of episode 2 (Hostility Passing-By). A Hostage with No Compromises was replaced by part 2 of episode 2 (A Fruitless Lunchtime) and thus, episode 2 was skipped, leaving the episode count at 11. The DVD release contained all the episodes in the intended order.

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Parent story: Fullmetal Panic!
Parent story: Fullmetal Panic! The Second Raid