As recorded history would have you believe, the Heian period was a golden age of ancient Japanese culture, an era in which the imperial court perfected poetry, aesthetics, and ritual while turning Japan away from foreign influence. However, there is a hidden history that tells a darker tale. The Heian era was not merely an age of elegance, but an age of ceaseless vigilance, when the veil between the living and the spiritual wore thin. The population was plagued by curses, spirits, and all kinds of yokai. Among them none were more feared than the Oni.

Far from the capital of Heian-kyō stood an abandoned shrine in a remote mountain province, where towering cedars climbed toward the clouds and dense mist drifted silently between their trunks. It was a humble peaceful place, its wood darkened and warped by age, its shimenawa rope frayed yet unbroken. Its caretaker was a young Shinto monk whose name has long since been forgotten. He tended the shrine alone, offering rice, salt, and saké to the kami of the land. The villagers came only when compelled to. They bowed low, made their offerings, and spoke in hushed voices of the kegare that stained the forest beyond the shrine.

It was rumoured the Oni had manifested with the new moon, and that lesser yōkai followed in his wake, drawn to his corrupted spirit like flies gathering around a rotting corpse Crops blackened, and blighted. The town's streams turned foul and brackish. Then the disappearances began. It wasn’t until a troupe of travelling musicians vanished along the mountain roads, leaving behind only scattered sandals and broken prayer beads. Only then did the monk understand the truth.

The surviving members of the troupe sought him out. A biwa player wearing the mask of a Tengu, a taiko drummer bearing the grinning face of a Hyottoko upon his mask, and a flutist hidden behind the features of a Kitsune, whose shinobue carried mournful melodies through the mountain air. The monk did not dismiss their fears.

Kegare is the stain of spiritual impurity. It spreads through the world unseen. It is not evil itself, but the residual spiritual energy left behind by negative emotions. death, suffering, violence, grief, hatred, and neglect cause kegare to form. It clings to places, objects, and souls alike, gathering slowly over time. An accumulation of kegare disturbs the natural harmony between the mortal world and spirits, creating wounds in the veil of reality through which darker things might peer. Lesser and Curses are drawn to such places by their nature, as carrion birds circling dying prey, while more malevolent spirits feed upon it, growing stronger as it spreads. Left unchecked, kegare does not merely invite misfortune, it calls to it.

He believed the kami had guided these survivors to him so that, together, they might restore what had been disturbed. On the night of a blood moon, when the veil between worlds weakened to its thinnest thread, the monk and the musicians climbed into the mountains. The sacred path led deep into the forest, where even the moonlight was nearly swallowed by the canopy above. At last they passed beneath a torii gate half-consumed by roots and moss and entered a clearing containing a solitary hokora shrine.

What once had been holy, now defiled. The Oni waited before it.Its crimson skin gleamed beneath the moonlight. Great horns rose from its brow, and hair as pale as winter snow fell across its shoulders. As the group approached, it offered a slow and mocking applause in recognition of the monk's courage. The air itself seemed to bend around the creature beneath the weight of its kegare. Lesser yōkai writhed at its feet, twisted by its presence and bound to its will.

The monk neither raised a weapon nor called for violence. Instead, he pressed a paper talisman against the torii gate and began to chant norito, ancient sacred prayers. Beside him, the musicians joined their voices and instruments to the rite. Each word invoked the will of the kami. Each syllable purified. Each invocation bound.

Invisible lines flickered into existence around the Oni as a kekkai formed, closing upon the creature like the bars of an unseen cage. The Oni lunged in fury. The forest shook beneath his rage. Trees split apart from the sheer spiritual pressure and the earth trembled beneath the impact of brute strength crashing against sacred ritual. Yet the monk stood firm watching and waiting. When the moment came, he stepped forward without hesitation and pressed an ofuda against the Oni's brow with two fingers.

The ink ignited with divine invocation. In that instant he offered everything he possessed: his breath, his spirit, and his life itself. He became the anchor of the seal. The wind screamed through the pines.The musicians played on through the storm as prayer battled fury beneath the blood-red moon.Behind them, the doors of the hokora burst open as though answering the monk's sacrifice.

The shrine's shimenawa snapped free and lashed outward like a living thing. Paper shide whipped wildly through the air as the sacred rope coiled around the Oni's limbs, binding wrists and ankles with relentless force. The crimson demon howled, a sound that rattled through the mountains. Then, impossibly, the creature folded inward upon itself and was dragged toward the shrine by a vortex of wind and divine pressure.

With a thunderous crack, the doors slammed shut. The three musicians stood frozen in awe. A deep absolute silence is all that followed, as if even the forest held its breath. Red spider lilies began to bloom, and carpeted the courtyard before the shrine. The ofuda that had rested upon the Oni's brow reappeared across the shrine doors, its markings glowing faintly before settling into stillness. The seal was complete.

The Oni had not been destroyed, only contained. His fury remained imprisoned beneath sacred bounds. Within the shrine, the Oni's power was rendered harmless. There he remained for a thousand years. Yet he was not entirely alone. During the ritual another creature had been drawn into the confinement of the shrine: a nekomata whose tail had split into two, each tip crowned with flickering blue flames. The Oni named the cat Fig. Over the centuries, the small black-and-white creature became his only companion. His only friend.

Beyond the shrine, the world changed. The wood rotted and moss and growth spread. The forest slowly reclaimed what had once been sacred ground. The tale of the Oni slipped quietly into obscurity. Yet within those sacred confines, something stranger still occurred. The shrine did not merely imprison the Oni. It purified him.

Century by century, the kegare that had once clung to his spirit was drawn away by sacred rites and holy ground. The corruption that had once gathered around him and called lesser yōkai to his side slowly diminished with each passing generation. The sacred bounds of the shrine wore away the spiritual stain that had defined him for so long, leaving behind not rage or hunger, but a strange and unfamiliar calm. In the end, it was the unlikeliest of circumstances that led to his release.

A student arrived at the forgotten shrine as part of her school's Occult Club community service program. She worked diligently, scrubbing graffiti from the torii gate and washing the stone courtyard surrounding the shrine from moss. The hokora itself she left for last as it was the most important structure there and by far the most fragile. Though, water, soap, and time are unkind to paper.

As she cleaned away decades of dirt and neglect, she unknowingly began to erode the ofuda sealing the shrine doors. Fig noticed it first alerting his companion by rubbing up against the palm of his hand. A thin line of light appeared within the darkness.

Then it widened, and widened still. At last, the seal broke. As violently as the Oni had once been dragged inside, he was thrown back into the world. He crashed into the girl, sending her phone skittering across the stone courtyard. She lets out a shriek of fear as she clammers backwards. Once to her feet she fled without looking back. The Oni rose slowly and steadied himself before turning toward Fig, who merely shook off the impact with an indignant flick of his twin tails.

Only then did the Oni notice the strange object lying nearby. A small construct of glass and metal. He lifted it carefully and studied its surface. Tiny figures moved within it. Voices emerged from somewhere inside. Entranced, he watched as images shifted and changed, their glow reflected faintly in his eyes. Holding the device with almost religious reverence, he followed the stream of moving images as he wandered down once sacred path and through the cedar forest.

The girl inside the glass laughed and spoke to the colourful words that appeared beside her face. Sometimes she played games. Sometimes she simply talked. The Oni watched every moment with fascination. The forest path was shorter than he remembered. Before long, the trees gave way not to the town he'd once terrorized, but to the edge of a school.

There stood the girl, half-hidden behind a man in a suit, pointing accusingly toward the red-skinned figure emerging from the trees. The man stepped forward with practiced composure. Though not without caution.

He explained that the Oni had apparently been sealed within a shrine located just beyond school grounds and that his sudden appearance had caused considerable distress among the students, particularly among the members of the Occult Club. Then a measured smile crossed his face. The Occult Club had long been an inconvenience. A drain upon school resources, a forgotten afterthought tolerated more than supported.

He explained that the Oni had apparently been sealed within a shrine located just beyond school grounds and that his sudden appearance had caused considerable distress among the students, particularly among the members of the Occult Club.Then a measured smile crossed his face. The Occult Club had long been an inconvenience. A drain upon school resources, a forgotten afterthought tolerated more than supported.

An opportunity had presented itself. The conditions were simple, The Oni would remain at the school and serve as the club's Class Coordinator and act kindly towards this modern humanity. Should he refuse, he would be returned to the shrine and sealed once more. Whether such a thing was truly possible hardly mattered, it was not a risk the Oni intended to take, So the ancient demon accepted the offer.

Privately, however, he negotiated a condition of his own. The students would teach him about the little people living inside the glass, they would explain streaming, and they would teach him how to do it himself. In exchange, he would teach them of curses, spirits, and yōkai that were not myths at all, but terrifying realities.

Thus the red-skinned Oni became a streamer.