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Its a really interesting story about a guy who puts an end to a death game only to have the game become reality and to realize 500 yrs have passed since he defeated that final boss.
The novel can be read here: https://www.baka-tsuki.org/project/index.php?title=The_New_Gate
or here: https://shintranslations.com/the-new-gate-toc/
the web novel can be found here though the stories seem pretty similar: http://www.sousetsuka.com/p/blog-page_11.html
The light novel version can be read here: https://wcctranslation.wordpress.com/table-of-contents/
The New Gate