Boys und Panzer, basically. When cold war up to modern tanks/vehicles enter Sensha-dō (or tankery), but falls under a separate league, and is only exclusive for boys. And with that, begins the story and journey of a transferee student named Ryota, who suddenly ends up joining Sensha-dō despite trying to avoid it. (Disclaimer: I do not own the GuP franchise in any way. Along with the references I made/will make throughout the storyline.)