I'm not good at writing story descriptions, but here's the idea: Ayanokoji Kiyotaka ends up transmigrated into Wataru Sajou's body at a bizarre-and frankly disgusting-moment. From there, the story unfolds.

(Completed) Do fireflies still exist? Anyway; What if you were to find a firefly that will bring you to the world of your favorite anime, Girls und Panzer!? You will have to experience how it is to live in an all-girls school (Even though you're the only boy). Even how to fight and participate in the tank warfare sport. There you will have to fall in love with the St. Gloriana overall tank commander, Darjeeling. So how is it going be? - - - When they've started using WWII tanks for sports, that was the peaceful days. Not until the international terrorist called Black Corpse laid chaos to the Sensha-dō Federation, and to the whole Asia. - - - This is a Male Reader X Girls und Panzer story. Action, adventure, a little bit of romance, love story, comedy, horror, all in it. It's a slice of life story! - - - I do not claim Girls und Panzer, including the images that will be used, they all belong to their respective owners.