Tells the same story as Full Metal Panic Second Raid and is as such, also based on the novels The End Of Day By Day. Leaving off after the original series, this series tells of Sousuke and Mithril as they fight Amalgam. Like the original series, but both sides have gotten a bit more aggressive...

A sergeant by the name of Sousuke Sagara is assigned an important task. That of guarding high school girl Chidori Kaname. Sousuke is a military genius, gaining high rank at an early age, but because of his strange upbringing, he lacks social skill. Now, he finds himself as a fish out of water as he attempts to protect a girl from an evil organization and turn in his school work on time. (Source: Anime News Network)

Basically, it's a retanking of some chapters from Full Metal Panic!. It's sort of like FMP! Fumoffu.. meaning that there's no mecha plotline, only short stories. Also there's an extra story not presented anywhere in each volume of this series.

It's been twenty years since that fierce final battle...Sousuke and Kaname are husband and wife, as well as loving parents to their children, Nami and Yasuto. A life of peace and quiet...is the last thing you'd ever see from this family! When you have parents like this, every day is bullets and bombs galore! (Source: Yen Press)

Kanie Seiya, a genius with both looks, intellect and athletic ability is suddenly threatened on a date to a park by the new transfer student. Turns out, the park is run down and the princess managing it wants our narcissistic main character to take over and save it! By the author of Full Metal Panic!

Sagara Sousuke isn't your typical high school student. He reads military enthusiast magazines; he responds to questions with "affirmative;" he brings grenades to school in his bag. Though everyone at school takes him for a hopeless military geek, Chidori Kaname thinks there might be something more to him. When their plane is hijacked in the middle of a field trip, Kaname's instincts will prove correct: Sousuke is an elite, mech-piloting mercenary... and he's here to protect her! (Source: J-Novel Club)

Amusement parks are places of wonder and fun for all ages... right? Well, that's not quite the case for Amagi Brilliant Park, a "crummy" amusement park on the outskirts of Tokyo where the snacks are inedible, the attractions are falling apart, and the mascots regularly get into fistfights with the guests. It's the kind of place that cool, handsome, brilliant Kanie Seiya wouldn't be caught dead in... until a mysterious girl drags him there--at literal gunpoint--and demands that he help them save the park! (Source: J-Novel Club)

Sagara Sousuke isn't your typical high school student. He reads military enthusiast magazines; he responds to questions with "affirmative;" he brings grenades to school in his bag. Though everyone at school takes him for a hopeless military geek, Chidori Kaname thinks there might be something more to him. When their plane is hijacked in the middle of a field trip, Kaname's instincts will prove correct: Sousuke is an elite, mech-piloting mercenary... and he's here to protect her! (Source: J-Novel Club)

Much akin to Full Metal Panic? Fumoffu, Overload is a series of seemingly random, silly, high school adventures of Sousuke and Chidori.

When an unknown Arm Slave surfaces somewhere in the Taiwan Strait near mainland China, MITHRIL orders Melissa Mao and her team to go into a divided Hong Kong to investigate the perpetrator of the unknown Arm Slave. As the team continues to check into the reports of the unknown Arm Slave, the culprit is believed to be a potential SRT recruit back from Sousuke's training days in Belize when he was not recruited by MITHRIL.

1. Side Arms - A Sad (Tonal) Range, A faraway (Firing) Range サイドアームズ - 音程は哀しく、射程は遠く 2. Side Arms 2 - Voice From the North サイドアームズ２ - 極北からの声

Tetsuro Kasahara manga adaptation of Shouji Gatou eponymous novel. *Note: This adaptation interrupted publication after a disagreement between the original novel author and the artist of the manga version over Gatou's disparaging comments of Swedish environmental activist Greta Thunberg, leading Kasahara to claim he will no longer promote Full Metal Panic! Zero nor draw any continuation, and will instead donate any profits from the manga to environmental groups.*