Kenichi Yamada has spent most of his adult life chasing the next punishing challenge in online gaming, only to find the modern landscape dominated by forgiving mechanics. As if fate were listening to his desire, Kenichi receives a sudden, mysterious invitation to an untitled game promising an inconceivable level of difficulty. Delighted, he selects its most ruthless setting without hesitation—Hell Mode.

However, instead of diving into another virtual game, Kenichi is reborn in another world as a peasant named Allen, forced to grapple with a cruelly complex system where even the basics of progression demand relentless effort. Consequently, Allen must build his strength from the ground up and learn to master the summoner class. With his resilience being tested at every turn, Allen embarks on an uncharted journey that might just prove to burn hotter than actual hell.