School clubs usually advertise their activities, but the goings-on of the GJ Club are a mystery. Kyouya Kyoro Shinomiya recently joined and became the sole male member of the five-person club. Besides Kyoro, there is Mao Amatsuka, the club president who has a tendency to bite Kyoro when she gets mad or bashful; Megumi Amatsuka, Mao's composed younger sister who always makes tea and desserts for the club's members; Shion Sumeragi, a demure chess prodigy; and Kirara Bernstein, a meat lover with a strong feline personality. All four girls have some form of interest in Kyoro. With the girls' idiosyncratic and cute personalities, Kyoro's time in GJ-bu will never be a dull one, for better or for worse.

Senshadou is a traditional sport using World War II era tanks in elimination-based matches. Widely practiced by women and girls alike, it's advertised as a form of art geared towards making ladies more prominent in culture and appealing to men. Becoming a worldwide phenomenon over time, the influence of senshadou leads to the creation of a world championship which will soon be held in Japan. Miho Nishizumi, who comes from a lineage of well-respected senshadou specialists, is at odds with the sport after a traumatic event led to her retirement and eventually a rift to form between her and her family. To steer clear of the practice as much as possible, she transfers to Ooarai Girls Academy where the senshadou program has been abolished. However, with the news of the upcoming championships, the school revives their tankery program, and Miho is pushed into joining. Now, with the aid of some new friends, she must overcome her past and once again take command of a squadron of tanks in an effort to save her school from closure, all while proving to her family that the Nishizumi-style of senshadou is not solely about victory.

The fourth film in the six-part Girls & Panzer: Saishuushou film series.

Having won the 63rd National Sensha-dou tournament, the girls from Ooarai Girls Academy managed to prevent their school from closure by the Japanese Ministry of Education. However, new troubles loom on the horizon: a ministry official argues that the deal was not legally binding and that the Ooarai school carrier is to be decommissioned. Students and their families are frustrated with this injustice and overwhelmed with despair; it seems little can be done to save the school. Their last glimmer of hope is a proposed match against the All-Stars University Sensha-dou team, consisting of the most talented students from all over the country. Despite Ooarai being severely outnumbered and clearly outclassed, they accept the challenge.