Kill the Sun

About Kill the Sun novel (NovelRoll Summary):

The protagonist, a boy with no memory, strives to become a Zephyx Extractor despite his haunting past with a Specter.
In a post-apocalyptic Earth ruled by terrifying Specters, a boy awakens in the desolate Dregs of Crimson Fungus City. With no memories, he trains to become a Zephyx Extractor, a powerful role that harnesses Specter powers. However, his previous encounter with a Specter disqualifies him, leaving him in despair. Just as hope seems lost, a mysterious stranger appears, promising to change his destiny forever. Will he rise against the oppressive rule of the Specters and uncover his true potential in this thrilling adventure?

Description:

Earth, many millennia post-apocalypse. A cataclysmic event led to the loss of advanced technologies as the Specters, terrifying entities with unimaginable powers, emerged and laid waste to the world. Humanity, through endless cycles of devastation and rebirth, tried to rebuild itself, only to fall once more. The past, a distant memory, has faded, leaving no trace of what humanity had achieved. Now, individuals live under the oppressive rule of the Specters. Amidst this chaos, a boy awakens with no memory in the bleakest area of Crimson Fungus City, known as the Dregs. As he grows, he becomes strong enough to qualify for one of the highest honors: a Zephyx Extractor, an individual capable of harnessing Specter powers. However, a past encounter with a Specter renders him unfit for this coveted role. Just when hope seems lost, a mysterious stranger appears, altering the course of his fate.