In a world where "Tankery," a martial art using tanks, is regarded as a refinement of the Yamato Nadeshiko alongside flower arrangement and tea ceremony, Nishizumi Miho transfers to Oarai Girls' High School, which notably lacks a tankery program. She suddenly reflects on her past, recalling that summer day when she met three girls through tanks. A heartwarming tank story featuring the overwhelming power of tanks and girls!