Eleven-year-old Sara Werec's elder brother, Ralph, was sent to the frontlines of an interstellar war 130 light years away, and Sara vowed to reunite with him one day as a comrade. Five years later, Sara is a student at Grapera Space Armed Soldier Academy, training to become a Reasoner, a pilot of an advanced weapons system called a Strain. When the academy is suddenly attacked by enemy forces, Sara enters battle against a Strain that quickly overpowers her. After incapacitating her, the pilot reveals himself to be her Ralph. Killing all the other students and destroying the school, he disappears, leaving Sara to question everything she has ever known. Soukou no Strain is the story of Sara as she reenters training under a new name, now determined to confront her brother and make sense of her brother's actions.

Riko Morisawa, a young girl from Tokorozawa, goes on a trip to Tokyo with her friend Mana. While they roam around the shops of Ikebukuro, Riko spots a billboard about an event related to the Little Battlers eXperience (LBX) line of toys. Mana urges Riko to purchase one, and although initially declining, Riko soon avails a few LBX kits for her father. Upon opening one of the boxes labeled LBX Assassin, a temporal rift manifests itself and transports Riko into the sky of an alternate Japan. While she falls at terminal velocity, an exosuit based on the LBX Assassin materializes around her, saving her from the descent. However, on the ground, she encounters the Mimesis, lethal metallic creatures that invade world after world. As she flees away from these monsters, Riko is rescued by four other LBX-equipped girls. After learning about Riko's predicament, the group decides to recruit her into their combat unit—Soukou Musume. Soukou Musume Senki narrates how the unit endures the trials and tribulations they face, developing unbreakable bonds along the way.

After a school trip goes terribly wrong, Homare Onishima, Shion Kujou, Asuka Suzumori, and Mutsu Amatani are left stranded on a deserted island. While Shion, Asuka, and Mutsu are frightened and desperate, Homare seems strangely calm. Fortunately for the group, this isn't the first time she's been stranded! Homare spent her childhood training with her survivalist father all over the world, climbing cliffs, trapping prey, building shelters, and obtaining valuable nutrition from moose testicles. To Homare, surviving on an uninhabited island with a slim chance of rescue is child's play. The only problem is the other three. As Homare shamelessly guides her classmates through the finer points of survival, including drinking fish blood and eating cicadas, the girls start to realize that being stranded might not be as bad as they had imagined.

Tatsumiyajima is the central island in the middle of a small cluster of islands, in a sleepy backwater of the Japanese isles. Not much happens there, and the island's young people go to school knowing that their lives are likely to remain peaceful and undisturbed. Or so they have been taught... but the truth is different. The fate of mankind is on the line, and Tatsumiyajima is the last line of defense against a hostile and incomprehensible enemy. At the center of it all, fighting for Humanity's continued existence, is the giant robot Fafner, the dragon that guards this final treasure of mankind. (Source: ANN)