In a world where "Tankery," a martial art using tanks, is regarded as one of the accomplishments of a Yamato Nadeshiko alongside flower arrangement and tea ceremony, Nishizumi Miho transfers to Oarai Girls' High School, which intentionally does not have Tankery. Observing the students at the school, she reflects on her past. Miho forms a team of four close elementary school friends, but due to a certain incident, she ends up fighting with one of the members. Amidst this, Miho hears that her friend is moving away... A heartwarming summer tank story featuring overwhelming tanks and innocent girls!