Yamada Kenichi, a 35-year-old office worker, has devoted himself to speedrunning games, frustrated by the rise of 'nuregames' flooding the market. Drawn to a mysterious website promising "For speedrunners like you," he finds himself transported to Hellmode—a parallel world frozen in an antiquated era. Now reborn as Allen, a summoned warrior destined for the throne, he awakens as a mere serf with no memory of this realm. Like the challenging games he conquered decades ago, Allen must navigate Hellmode from absolute zero, armed only with his speedrunner's instincts and determination. His ascent from servitude to kingship begins here, in a world where knowledge is as scarce as it is essential.