Tsuihou sareta Ochikobore Henkyou de Ikinuite SRank Taimashi ni Nariagaru

This world is ruled by the Twilight 150 years ago war broke out between humans and demons The humans suffered massive casualties as a mysterious phenomenon called Twilight took over the world In that world there exists a certain average boy One day unfairly abandoned by his party members hes consumed by the Twilight
Two years pass In the uninhabitable twilight that boy struggles like mad to survive Eventually he returns to the barrier city with the powerful skills he acquired in the Twilight What awaits him next No matter what he moves forward believing that a blue sky awaits him beyond