I'm Done Being the Guardian — Episode 15

Julian Cross was the embodiment of Earth's will. Becoming a god at the age of ten, he single-handedly defended the Demon Pass for 30 years, securing peace for humanity. Yet, he was deemed a threat and exiled. The moment he left, the demons returned, and the slaughter began. The Federation begged for his help, but Julian had vanished. As the blood-drunk beasts launched another assault, Julian made just one move. One strike. They ceased to exist.