ギャルバサラ－戦国時代は圏外です－ (2011)

Japan is at war in the samurai era some 440 years ago. A high school student time travels to the era alongside class-mates who are all uniformly weak at history. They know next to nothing about the time period. They come across many problems and want to help solve the issues, but can they when they know nothing? Could they make things worse?