The Level 999 Villager

"LV999 Villager" (Level 999 no Murabito) is a Japanese light novel written by Koneko Hoshizuki. It was serialized on the website "Shōsetsuka ni Narō" from July 2015 to December 2018, and the book version was published by KADOKAWA from April 2016 to January 2019. Fuumi is in charge of the illustrations.

Source: Wikipedia