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Yuta stared at the ancient book in awe. Its leather cover was worn and faded, its pages yellowed with age. It was unlike any other book he had seen in the Tokyo Jujutsu Technical High library.

"What's that?" His friend Megumi asked, peering over his shoulder.

"I'm not sure," Yuta replied, flipping through the pages. "But it looks like some kind of spellbook."

Megumi frowned. "Be careful with that, Yuta. There's a reason it's hidden away."

Yuta nodded, his eyes scanning the text. He couldn't read most of it—the characters were archaic and unfamiliar—but there were a few phrases that caught his attention.

"Listen to this," he said, pointing to a passage. "'By performing this ritual, one can gain unimaginable power.'"

Megumi sighed. "Yeah, that's what I'm afraid of. Look, Yuta, I know you're curious, but you shouldn't mess with stuff like this. It could be dangerous."

Yuta hesitated for a moment before closing the book and tucking it under his arm. "You're right," he said with a nod. "I'll put it back where I found it."

As they walked out of the library together, Yuta couldn't help but feel drawn to the book. Its promise of power was intoxicating, and he couldn't get it out of his mind.

That night, as he lay in bed unable to sleep, he found himself thinking about the book again. The desire for power burned inside him like a flame.

"Just one little spell," he whispered to himself. "What harm could it do?"

Slipping out of bed and grabbing the book from his backpack, Yuta made his way to the school rooftop—the only place where he wouldn't be overheard.

He opened the book to a random page and began reciting the incantation. The words felt strange and foreign on his tongue, but he persisted. Suddenly, a rush of energy surged through him, making his head spin.

Yuta collapsed to his knees, gasping for breath. He had done it. He had performed a spell from the ancient book.

As the days turned into weeks, Yuta found himself drawn deeper into the book's dark magic. It whispered to him in his dreams, urging him to perform more rituals and use forbidden spells.

At first, Yuta resisted its influence. He knew that using such powerful magic came with a price. But as time went on, he found it harder and harder to say no.

The book's power was intoxicating. With each spell he performed, Yuta could feel himself growing stronger—faster—more powerful than ever before.

But there was a cost. Every time Yuta used the book's magic, he could feel something inside him changing—a darkness creeping into his soul.

He tried to hide it from his friends and classmates, but they began to notice something was off about him. Megumi confronted him one day after class.

"Yuta," he said quietly. "What's going on with you? You've been acting strange lately."

Yuta looked away, unable to meet his friend's gaze. "It's nothing," he said dismissively. "I'm fine."

Megumi sighed and placed a hand on Yuta's shoulder. "You don't have to do this alone," he said gently. "We're here for you, whatever you're going through."

Yuta felt a lump in his throat as he fought back tears. He wanted so badly to tell Megumi everything—to ask for help—but the book's hold on him was too strong.

"I appreciate that," he said finally, pulling away from Megumi's touch. "But I can handle it."

As the days turned into weeks, Yuta's control over the book's magic began to slip. The spells he performed grew more and more dangerous, and he struggled to contain their power.

One night, as he attempted a particularly risky ritual, something went horribly wrong. The magic spiraled out of control, engulfing Yuta in a blinding light.

When the light finally faded, Yuta was gone.

In his place stood a creature of darkness—a cursed spirit born from the book's magic. It laughed—a cold, cruel sound—as it surveyed its new form.

The creature knew what it had to do. It had to find a new host—a new vessel—to continue its dark work.

And it knew just where to look.