Kenichi Yamada, a hardcore gamer, is left searching for a new game after his favorite online game shuts down. He can't find anything that offers the same level of punishing difficulty he craves. That is, until he discovers an untitled game promising incomparable challenge and unprecedented potential, prompting him to select the "Hell Mode" difficulty. He is then reincarnated in another world as a serf, where he must navigate the mystery of his Summoner class without the aid of walkthroughs or online resources.