"Girls und Panzer: Ribon no Musha" is a spin-off manga series set in the "Girls und Panzer" universe, focusing on the Ribbon Warrior team and their journey in the world of tankery. The story centers on Riko Matsumoto, a first-year student at Tatenashi High School, who forms her own tankery team after being inspired by the sport. Unlike traditional tankery teams, Riko's group operates independently, using unconventional tactics and a single tank, the Type 95 Ha-Go, to compete against larger, more established schools.

Riko's team, named Ribbon Warrior, is composed of misfits and underdogs, including the quiet and skilled driver Shizuka Tsuruki, the enthusiastic but inexperienced gunner Akebi Sasaki, and the resourceful loader and mechanic, Kiyomi Sugiyama. Together, they challenge various schools in tankery matches, often relying on creativity, teamwork, and Riko's unorthodox strategies to overcome their opponents' superior numbers and firepower. The series emphasizes themes of perseverance, ingenuity, and the value of teamwork, as Ribbon Warrior faces increasingly difficult opponents, including elite schools like Kuromorimine and Pravda.

The narrative explores the dynamics of tankery as a sport, highlighting the camaraderie and rivalries between teams. Riko's determination to prove herself and her team's worth drives much of the plot, as they navigate the challenges of limited resources and skepticism from more established teams. The series also delves into the personal growth of its characters, particularly Riko, who evolves from a lone dreamer into a capable leader. Through its focus on underdog victories and strategic battles, "Girls und Panzer: Ribon no Musha" offers a fresh perspective on the tankery world, blending action, humor, and character development in a way that complements the broader "Girls und Panzer" franchise.