A Banished Failure Survives in the Borderland and Becomes an S-Ranked Exorcist

This world is governed by the Twilight. 150 years ago, a war erupted between humans and demons. Humans endured heavy losses as a mysterious phenomenon known as "Twilight" engulfed the world. In this twilight realm, there exists an ordinary boy. One day, unjustly deserted by his companions, he finds himself overtaken by the Twilight. Two years pass. In the uninhabitable twilight, the boy fights desperately to survive. Eventually, he returns to the barrier city, now possessing powerful skills gained within the Twilight. What awaits him next? Regardless of the challenges, he presses forward, believing that a blue sky lies ahead. (Source: Galaxy Degen Scans)