The light novels by Shinkoshoto that the manga is based on are called Tensei Kenja no Isekai Life: Daini no Shokugyō o Ete, Sekai Saikyō ni Narimashita which most translations put as "The Reincarnated Sage's Alternate World Life: I Got a Second Profession, and Became the Most Powerful in the World".

Now in a fantasy world far removed from paperwork and computers, Yuji has just one thing on his mind: waking up from what he thinks is a dream and getting back to the mountain of work he left behind!