Seiji Aizawa, a high school teacher who has been summoned to another world with 30 students in the class! While the brave students were endowed with cheat combat skills, Aizawa was given "repair [repair]", a skill that never activates. And at the time of the first practical training, Aizawa is trapped in the ancient ruins with the ferocious Minotaur. However, at that time, the "repair" skill is finally activated! The sleeping android awakens and instantly kills the Minotaur !! After that, they are transferred to the outside of the ruins, but it was a strange land far from the original country ...! Thus, Aizawa embarks on a journey around a different world with the mechanical girl [Brynhildr] in order to return to the students.