Sergeant Sousuke Sagara returns to Jindai High School to protect the precious war asset, Kaname Chidori, from any threat. However, his lack of social skills and real-life experience result in comical yet dangerous situations, endangering the peaceful school life Kaname longs for. As Sousuke continues to bring a wide range of weapons to school as a means to solve threats—real or fake—Kaname struggles to fulfill her duty as the student council vice president all while keeping him in check. To ensure a successful mission, Sousuke is occasionally forced to use the costume of a famous amusement park mascot called Bonta-kun. With his technical expertise, he eventually transforms the exuberant uniform into a cutting-edge exoskeleton that has only one dysfunction: the voice translator can only produce the sound "mofu." Full Metal Panic? Fumoffu depicts the adventures of Kaname and Sousuke as they try to live their normal school lives despite the chaos they inadvertently cause. [Written by MAL Rewrite]

Two years have passed since the catastrophic event known as the "Continent's Dropping" from the first OVA episode. Yumemi still has not forgotten her ability to see the world above, but now she's in the last years of middle school, tests and real life take over. Unknown to the people of the world, Akuto the world still thrives, but the war rages on. In need of help, Gaz, sends Munto down to Earth once more to find the "Girl of Destiny" in order to save Heaven from its untimely demise. Yumemi must once again confront the world only she sees, and not even her friends Ichiko and Suzune can help her. (Source: ANN)

Tomoya Okazaki is a delinquent who finds life dull and believes he'll never amount to anything. Along with his friend Youhei Sunohara, he skips school and plans to waste his high school days away. One day while walking to school, Tomoya passes a young girl muttering quietly to herself. Without warning she exclaims "Anpan!" (a popular Japanese food) which catches Tomoya's attention. He soon discovers the girl's name is Nagisa Furukawa and that she exclaims things she likes in order to motivate herself. Nagisa claims they are now friends, but Tomoya walks away passing the encounter off as nothing. However, Tomoya finds he is noticing Nagisa more and more around school. Eventually he concedes and befriends her. Tomoya learns Nagisa has been held back a year due to a severe illness and that her dream is to revive the school's drama club. Claiming he has nothing better to do, he decides to help her achieve this goal along with the help of four other girls. As Tomoya spends more time with the girls, he learns more about them and their problems. As he attempts to help each girl overcome her respective obstacle, he begins to realize life isn't as dull as he once thought. [Written by MAL Rewrite]

Tomoya Okazaki and Nagisa Furukawa have graduated from high school, and together, they experience the emotional rollercoaster of growing up. Unable to decide on a course for his future, Tomoya learns the value of a strong work ethic and discovers the strength of Nagisa's support. Through the couple's dedication and unity of purpose, they push forward to confront their personal problems, deepen their old relationships, and create new bonds. Time also moves on in the Illusionary World. As the plains grow cold with the approach of winter, the Illusionary Girl and the Garbage Doll are presented with a difficult situation that reveals the World's true purpose. [Written by MAL Rewrite]