Yamada Kenichi is a 35 year old salaryman. Although he's habitually absorbed in speedrunning through games, he had been lamenting over the current trend of 'nuregames'* (ヌレゲー).

And as such, he was captivated by a site with the catchphrase "For you, who likes to speedrun through games" and ended up reincarnating in the world of Hellmode.

This is a story about summoned warrior, Allen, and his road to kingship.

As Allen reincarnated as a serf, he knew nothing of this world. Allen's story will begin with absolutely no knowledge of the world at all, just like those games he had played 10, 20 years ago.