This story takes place after the Girls Und Panzer der Film where boys are suddenly allowed to participate in Senshado. It's about a boy that suddenly decides to take up Senshado and leave behind his normal life and start a new one. He meets Miho and the rest of the characters in his adventure.

Ever since the introduction of foreign students to Saunders, the student body has been split. Should they be allowed to attend with the full privileges of students, or should they be denied enrollment? After a close election, the tension between these ideals boils over and the school decends into a civil war, one that will determine the school's fate forever.