Ao Gennai is a completely average first-year high school student—that is, until a mysterious package is delivered to her home one day. Inside she finds Gourai, a tiny humanoid robot capable of movement and combat known as a Frame Arms Girl. Gourai is the first of her kind, possessing an extremely advanced AI that allows her to form a personality, learn, and grow, much like the human mind. Following Gourai's activation, Ao is thrust headfirst into the world of Frame Arms Girls as more and more of the intelligent robots are delivered straight to her front door. With a rather hefty cash incentive pushing her forward, Ao is committed to collecting as much data about the Frame Arms Girls and their combat as possible, all while they learn what it means to be human.

Under the tutelage of the great demon warlock Romberg, Ike grew up with knowledge regarding an ancient advanced civilization that once ruled the land. Coupled with his innate talent in magical arts, this upbringing allows Ike to quickly rise in the Demon Lord's army ranks, leading his brigade to consecutive victories against humans. However, Ike has a secret—he is a human himself. Despite knowing all too well the consequences if this information is ever to leak, Ike is willing to face such immense danger to achieve his goal: find a way for humans and demons to coexist and stop the war that has been carried on for far too long.

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.

Al Wayne's greatest goal is to become the best farmer he can be. With utmost effort, he reaches the apex of his farming skills and earns the title of a first-rate cultivator. Due to this achievement, Al gains a substantial upgrade to his stats which now eclipse even the strength of legendary heroes of old. Soon after discovering his potential, the royal family enlists his help against the rising number of disasters that coincidentally began right as his true power was awakened. Although reluctant, Al concedes that in order to protect his precious fields, he must do his best to keep all threats at bay.