Title: The Devil's Eye

Chapter 1: The Birth of the Curse

Rin, a 17-year-old boy, lived a life filled with failure and frustration. He felt aimless, without a future, just an ordinary person in a world that didn't want him.

One day, while wandering the city at night, he heard a strange sound coming from an old sewer drain. Curiosity drove him closer, and as he peered inside, a mysterious entity rushed into his right eye. A moment of searing pain knocked him unconscious.

When he awoke, he found himself in a hospital. He tried to get up, but his body felt strangely heavy. Looking into the mirror, he saw that his right eye had turned into a glowing red hue. Little did he know, this moment would change his life forever.

Chapter 2: The Beginning of Power

The next day, Rin returned to school, trying to act as if nothing had happened. But when one of his classmates attempted to hit him with a bat, his body moved instinctively, effortlessly dodging the attack. He realized he could predict movements before they happened.

But that wasn't all. Over the next few days, he noticed that his strength increased unnaturally whenever he got angry. However, there was a voice inside him, mysterious whispers trying to lure him into using more of his power.

That night, when he returned home, a terrifying being appeared before him—a demon with black horns and burning eyes. "I am the one who dwells within you…" the demon said with a sly grin.

Chapter 3: The Abduction and the Mission

One day, Kyle, Rin's closest friend, mysteriously disappeared, leaving no trace except for a strange mark on his bedroom wall. Rin felt something unnatural was happening. After investigating, he discovered that Kyle had been kidnapped by demons and taken to their underworld.

With no other choice, Rin set out to rescue his friend. Upon arriving in the demon world, he found himself in the middle of an ongoing war between humans and demons. An entire army of demons served their king, a being powerful enough to destroy planets with just a wave of his hand.

But even more dangerous was Azaroth, one of the strongest legion commanders, rumored to be 15 times stronger than Rin.

Chapter 4: The Battle Against Azaroth

When Rin faced Azaroth, he had no chance. Azaroth was incomprehensibly fast and strong, defeating Rin with ease. As Rin lay on the verge of death, a mysterious figure appeared and saved him from his impending doom.

It turned out that this figure was Kyle, but he wasn't entirely human… He was Azaroth's younger brother. Unlike him, however, he was kind. Kyle possessed strength equal to Rin's and had a goal—to end the reign of demons.

Chapter 5: The Fearsome Vice Commander

After defeating Rin, Azaroth sent his vice commander to finish the job. This vice commander was an unfathomable force, beyond imagination. Kyle fell quickly before his attacks, and it seemed Rin wouldn't survive either.

Just as the vice commander was about to deliver the final blow to Rin, a miracle occurred. The overwhelming rage inside him exploded, triggering a new transformation.

Four arms, four glowing eyes—his power had multiplied tremendously, and his speed had become terrifying. Thanks to his four eyes, he could perceive all of the vice commander's movements, launching a relentless barrage of attacks until he finally emerged victorious.

Chapter 6: Retreat and Recovery

After the battle, Rin returned to his normal form, only to collapse, vomiting blood. His body wasn't used to such overwhelming power. He realized he still needed to master his abilities.

He and Kyle decided to withdraw temporarily to recover and strategize. A long journey lay ahead before they could reach the Demon King, and many powerful legion commanders awaited them.

But they agreed on one thing…

They wouldn't stop until the Demon King fell.

The end… or is it just the beginning?