Kyousuke's younger sister Namika has been living apart from him for ten years. One day, she returns and begins to live with him again, but she has turned into an energetic Osaka girl.

A fantasy action set in a world of Western films. One day the Nohara family, Kasukabe Defense Forces (Shinnosuke Nohara and his mates: Kazama-kun, Nene-chan, Masao-kun and Bo-chan), and other people living in Kasukabe City get lost in a world within a Wild West film, which is a city ruled by an evil governor named Justice. The time progression has been stopped there because the film is unfinished but people are losing their memories about the past little by little. To go back to their former world, the Kasukabe Defense Forces tries to defeat Governor Justice and finish the film before everyone loses their memories.

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. [Written by MAL Rewrite]

OVAs bundled with the 17th, 19th, and 23rd tankoubon volumes of the Golden Kamuy manga.