While Riding the Bus on a School Trip, We Time-Slipped to a Military Facility Just Before World War I

Third-year middle school student Shinta Shinjo is on a school trip to Tokyo. He's a bit of an oddball otaku who loves history and war games. But the trip is being led by a frustrating teacher, Mr. Bando, who keeps badmouthing Japan and the Self-Defense Forces, much to everyone's annoyance. Suddenly, as the bus passes under a large torii gate, a blinding light engulfs them. When Shinta opens his eyes, he finds himself at the Tokyo Arsenal in 1900. Real soldiers of the Imperial Japanese Army surr