Tsuihou sareta Ochikobore, Henkyou de Ikinuite S-Rank Taimashi ni Nariagaru追放された落ちこぼれ、辺境で生き抜いてSランク対魔師に成り上がる; A Banished Failure Survives in the Borderland and Becomes an S-Rank Exorcist; Изгнанный неудачник выживает в пограничье и становится экзорцистом S-ранга; 被放逐的尘埃在边境中生存进阶成S级对魔师

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, he's 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.