Ninth grader Yotsuya Yuusuke is useful, friendless, as well as not active in any type of clubs. After that one day, he and also 2 women schoolmates are suddenly sent to another globe where they need to collaborate to battle for their lives. Yotsuya is a lone wolf as well as has always lived his life according to his wants, yet just how will that exercise since he's expected to be a hero?!