Cursed Reincarnation

Prologue: The End of a War

It was finally over.
They had won, but at the cost of so much along the way. The Hashira were now gone, giving their lives to stop the demon that tortured innocent humans for decades. Sanemi and Giyuu were the only two to survive and morn the deaths of their fellow comrades.
In the wake of the battle relief and grief filled the air as the survivors stood back to take in the destruction and death. Shouts of triumph and the pain of loss echoed on the quieted battle field as the sun slowly began to peak over the horizon. Our young heroes looked around accessing their losses as four pairs of eyes landed on one figure hunched over on their knees in the middle of the street. The figure was missing one arm while the other still tightly clutched onto the black sword.

Even though our young heroes knew who the figure was, they still couldn't believe their eyes as they stared at the lifeless and unmoving body of their friend, Tanjiro Kamado.
Giyuu limped forward and knelt down in front of his friend. He stared at the sun breather unable to process another loss for someone he cared about so dearly.

Suddenly, without warning, Tanjiro lifted his head and his eyes snapped open, his pupils now slits resembling that of a cats. The core members surrounding Tanjiro froze in shock and disbelief.
This wasn't happening. It couldn't be.

In the blink of an eye Tanjiro's missing arm grow back with no effort. Giyuu reacted quickly shoving one of the core members out of the way as Tanjiro swiped at them with his newly regenerated arm.

"Tanjiro...why?" Another core member staggered back a step barely able to move as he was met with the hungry, bloodthirsty grin of the newly formed Demon King Tanjiro.

"Get Back!" Giyuu yelled, sprinting towards the demon. Suddenly the sun rose over the hill completely illuminating the battle field and engulfing Tanjiro. The newly formed demon let out a painful, blood curdling scream dropping to his knees as his skin began to burn and blister from the rays of light.

"Don't just stand there! Get Away!" yelled Giyuu.
"But Tanjiro is..."
"Anyone who is still able to fight grab a weapon and group up!" The desperation in the water hashira's voice was clearly evident, frightening the conscious core members. Inosuke and Zenitsu froze upon hearing Giyuu's next words.

"Tanjiro has become a demon! We have to keep him under the sun and burn him to death! Kill Tanjiro before he kills anyone!" Giyuu launched himself at Tanjiro, stabbing him and knocking the demon to the ground, keeping him from finding any shade to hide from the sun.

Giyuu begged, pleading for Tanjiro to stay the way he was and die as a human not a demon. He couldn't handle losing someone so precious to him like this.

But things only seemed to get worse.

The burning of Tanjiro's skin stopped and immediately his skin was healed. Tanjiro swiped at Giyuu clawing the water hashira's jaw. The demon swiped at his friend again only to be blocked by Inosuke.

"What are you doing?!" Yelled the boar masked demon slayer.
"This is half-and-half Haori guy! He's our ally!"

Zenitsu hobbled forward being carried by another core member. "Tanjiro!" He yelled.

The newly formed demon king crouched down on all fours growling, drool pouring from his mouth. His red mark had now grown spreading across his face like a bloody scar.

"No way..." Zenitsu whispered, "Tanjiro? No one can fight anymore. We're all beat up! This is awful..."
Tears poured down the thunder breathing demon slayers face as he stared at his friend in disbelief.

"...Tanjiro?"

Tanjiro launched himself at Inosuke swiping left and right, quickly closing the gap. Inosuke blocked each strike fighting back with what little strength he had left, but his thoughts began to run rampant as he images and memories of a smiling and kind Tanjiro filled his head.