Kono Sekai ga Game dato Hanmei Shite 100-nen ga Sugita

is a Japanese light novel series written by Ki Mizu, with illustrations by Pisuke. The series began publication on July 10, 2018 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
A world where 100 years have passed since we knew we were the inhabitants of the game.

Even the meaning of adventure has become a mere "custom".

Heading to the coming-of-age ritual "First Quest," Migia faces an unprecedented situation that could never have happened in this world.

It was Zeku, a level 1 swordsman who boasts tremendous sword skills, who saved that predicament.

Who is this boy who calls himself a player?

And what is the mystery hidden in this world that he is trying to unravel?

With the first player in 100 years, the closed game world will change !?