Yuusha ni Minna Netoraretakedo Akiramezu ni Tatakao! Kitto Saigo wa Ore ga Katsu (Japanese: 勇者にみんな寝取られたけど諦めずに戦おう。きっと最後は俺が勝つ。) is a dark fantasy "revenge" series that has gained attention for its gritty take on the "summoned hero" trope. Originally starting as a web novel, it has since been adapted into a light novel and a serialized manga.
Written by Satou and published by Shinkigensha. It provides the most detailed world-building and character internal monologues. Yuusha ni Minna Netoraretakedo Akiramezu ni Tatakao
The series is available in several versions, often categorized as "raw" (Japanese) or translated: Yuusha ni Minna Netoraretakedo Akiramezu ni Tatakao
The original "draft" version of the story where the plot was first established. Yuusha ni Minna Netoraretakedo Akiramezu ni Tatakao