While attempting to skip out on a homework assignment and meet up with his friends at the arcade, a teenager by the name of Yusis is suddenly enveloped in a blinding light and transported to Kreisiaーa world where fantasy meets reality.
Soon after, he learns he has been summoned as a Savior to deliver Kreisia's people from the threat of the Overlord. Thinking everything happening around him is simply a dream, Yusis readily agrees to the task of saving the world and begins preparing for what is inevitably to be far more than he ever bargained for!