Long ago, in a time when the skies were ruled by the ethereal beings known as the Kami, the world below was shadowed by a race of Oni, creatures both feared and revered. Among them was a singular Oni, Shōjo, who stood apart. Shōjo was neither the terrifying brute nor the wicked trickster common to their kind; instead, she was a beautiful and enigmatic being, a master of illusions with the ability to charm the very air itself. Her skin shimmered like moonlight, and her crimson hair cascaded like a waterfall of fire. Yet, it was not her beauty that set her apart, but her profound desire for flight - the longing to soar among the Kami and see the world from the heights of the gods.
In the Oni world, flight was a gift of the gods. None of her kind had ever tasted the winds of the heavens, and the Oni, bound to the earth by their nature, could only dream of the skies. Shōjo's yearning, however, was not born of simple desire; it was an obsession, an ache in her very soul that no earthly pleasure could soothe. She sought the key to the heavens, a mythical artifact said to unlock the gates of the gods and grant the bearer the power of flight. This key was rumored to be hidden in the deepest and most forbidden part of the Kami's domain, within the sacred Garden of Kōri, a place where no Oni had dared to tread.

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But Shōjo, clever and determined, was not deterred by the dangers that lay ahead. She learned of an ancient prophecy that spoke of a time when the key would be accessible to one who could deceive the gods themselves. This prophecy spoke of a creature who would manipulate the winds, trick the stars, and walk upon the skies without the blessing of the Kami. She knew in her heart that this was her fate. To reach the Garden of Kōri and claim the key, she would need an ally, someone who could guide her through the labyrinth of divine traps and barriers.
In the shadowed corners of the Oni realm, Shōjo found her companion - an ambitious and cunning spirit named Daichi. Daichi was a Kami in exile, cast down from the heavens for a crime long forgotten, and now he wandered the earth, bitter and yearning for the divine power he once possessed. He was known for his ability to weave illusions and bend the elements to his will. To him, Shōjo appeared as a beacon of opportunity - a way to regain his lost powers and take vengeance upon the gods who had cast him aside. Together, they forged a plan.
Shōjo promised Daichi that when she claimed the key, she would grant him the power of flight as well, for she believed that only one who was truly free, like the Kami, could wield such an artifact. In return, Daichi would use his knowledge of the Kami's sacred pathways to guide her through the perilous realms that separated her from the Garden of Kōri. Yet, Shōjo harbored a secret: she intended to betray Daichi. She knew that once she possessed the key, the power of the heavens would be hers alone, and Daichi would no longer be of use. The Oni had no need for the Kami once they could soar above them.
The journey was fraught with peril. They crossed the fields of eternal fog, where the dead wandered aimlessly, and traversed the caverns of the shadowed mountains, where the very rocks seemed to whisper their secrets. Daichi's illusions protected them, keeping the Kami's watchful eyes at bay, but the deeper they ventured, the more strained their alliance became. Daichi grew increasingly suspicious of Shōjo, sensing her true intentions but unsure of her plan. Despite his caution, he was still captivated by the promise of power.

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Finally, they arrived at the Garden of Kōri, a place of unparalleled beauty, where the air shimmered with the magic of the Kami. But the garden was a trap. The key to the heavens lay hidden within a sacred tree, its roots twisting deep into the earth, and its branches stretching far into the sky. Only those with the purest hearts could claim it, or so the Kami believed. To them, Shōjo appeared to be the purest of creatures, her beauty and charm masking the darkness that resided in her heart. But the Kami had not foreseen her cunning.
As Shōjo approached the tree, Daichi stepped forward, eager to claim his share of the power they sought. He believed that the key would be theirs to divide between them. But Shōjo, with a final burst of deceitful grace, struck first. She reached out with trembling hands, not to grasp the key, but to sever the very roots of the tree. With one swift motion, the tree cracked, and the earth beneath them trembled. The Kami, enraged by this sacrilege, descended from their heavens in a fury.
In that moment, Shōjo's betrayal was revealed. The winds howled, and the sky darkened. The Kami cast their judgment upon Daichi, stripping him of his form and binding him to the earth, while Shōjo stood, defiant and triumphant, at the base of the tree. But the Kami's vengeance was not swift. They knew that Shōjo had been driven by desire, and they understood that the true punishment would lie not in her death, but in the isolation of her spirit.

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Shōjo grasped the key, her heart swelling with triumph, but as the key touched her hands, she felt a heavy burden descend upon her. The sky above her turned black, and her wings, which had once been promised to her, remained shackled to the earth. She could no longer ascend. The Kami's punishment was subtle yet complete. She was granted the power of flight, but only within the confines of her own mind. She could soar through the heavens in her dreams, but never again in the physical world.
For all her cunning, Shōjo had lost the very thing she desired most. The Kami's vengeance had bound her to a fate worse than death - a life of eternal yearning for the flight she could never truly have. In the end, Shōjo was left to wander the earth, forever chasing the winds, forever haunted by the skies.
And thus, the myth of Shōjo, the Oni who betrayed the Kami, was born. Her story serves as a warning to all who seek power through deceit: that the greatest of betrayals often leads to the deepest of curses. Though the key to the heavens may be within reach, it is the heart that must be pure to claim it, and no amount of illusion or trickery can change the fate that awaits those who seek to defy the gods.