A Hero Turned Demon!?

Prologue

Izuku Midoriya, the young hero-in-training, had fought bravely against the villain Overhaul, but unfortunately, he met his demise during the battle. His body was seemingly teleported away, and he found himself in a forest around midnight. Confused and disoriented, he had no recollection of his powers and had essentially lost them.

As he stumbled through the forest, he heard screams of people in pain. Izuku ran towards the sound as fast as he could to see what was happening and if he could help. When he got there, he saw a man getting ready to attack a young girl. He rushed at the man and tackled him, but in his distraction, the man slashed him across the chest. Izuku fell to his knees in front of the man, overwhelmed with pain.

After a while, Izuku woke up to someone carrying him. Scared out of his mind, he freaked out and pulled the person backwards off a cliff into the snow. They both landed with a soft thud.

"My name is Tanjiro Kamado, I was taking you to a hospital to get you taken care of. If you don't mind me asking, who are you?" The boy, now known to Izuku as Tanjiro, asked.

"I don't know who I am... Wait! Is that girl okay? The one at that house?" Izuku asked frantically.

Tanjiro nodded. At this time, Nezuko made it to the three of them, her eyes filled with worry and confusion. She looked at Izuku, her gaze flickering with recognition.

"Izuku...?" Nezuko whispered, her voice tinged with uncertainty.

Izuku's heart skipped a beat. He felt a faint connection to Nezuko, as if they shared some unknown bond. Although he couldn't remember his past, there was a strange familiarity in her presence.

Before anyone could utter another word, a powerful gust of wind swept through the area, causing the surrounding trees to sway and leaves to dance in the air. The atmosphere crackled with an intense energy, as if something extraordinary was about to unfold.

From the shadows emerged a tall figure, clad in a dark haori that billowed in the wind. His sharp, piercing gaze focused on Izuku, studying him intently.

"I am Giyuu Tomioka, a Demon Slayer of the Water Hashira," he declared, his voice calm but commanding. "I can sense a different aura within you, one that is not entirely demonic."

Izuku's eyes widened as he absorbed Giyuu's words. It seemed that his newfound identity as a demon was more complex than he had initially thought. Conflicting emotions swirled within him—fear, confusion, and a glimmer of hope.

Tanjiro stepped forward, his voice firm. "Giyuu, please listen to me. Izuku saved Nezuko's life, and I can sense something different about him. We need to understand more before jumping to conclusions."

Giyuu's stern expression softened slightly as he regarded Tanjiro. "I trust your judgment, Tanjiro. But be aware that demons pose a grave threat, and we must be cautious."

A tense silence settled among them as the weight of the situation hung in the air. Izuku's mind raced, grappling with his newfound identity, the memories he couldn't access, and the uncertain path ahead.

Giyuu finally broke the silence, his voice laced with determination. "Izuku, if you truly have the potential to control your demonic nature, we may be able to harness it for the greater good. But first, you must prove your intentions and undergo rigorous training at the Demon Slayer Corps headquarters."

Izuku nodded, a spark of determination igniting within him. Despite the overwhelming challenges he faced, he couldn't ignore the call to protect others and seek the truth about himself.

With their paths now intertwined, Izuku, Tanjiro, Nezuko, and Giyuu embarked on a journey to the Demon Slayer Corps headquarters. There, Izuku would begin his arduous training, discovering the depths of his blood demon art and unravelling the mysteries of his past.

Little did they know, their encounter would shape not only their own destinies but also the fate of the intertwined worlds of heroes and demon slayers.

As they ventured forward, united by a shared purpose, their resolve burned brightly—a beacon of hope against the encroaching darkness. The story of the now-demon Izuku Midoriya was just beginning, and the path ahead promised both trials and revelations that would redefine his place in this new world.