At the mere shadow of Ritsuzen Kaguya, the temperature in the woods seemed to plummet. The fireball that Riku had been meticulously constructing collapsed, the flames snuffed out as if the oxygen had been vacuumed from the clearing.
Riku recoiled. A jagged flash of primal fear bypassed his arrogance, forcing his body to turn around and straighten into a rigid, ninety-degree bow before he could even process the impulse.
"Successor," he managed, his voice strained, all the previous bravado replaced by a visible tremor.
Behind him, his goons hit their marks like puppets with their strings cut, their foreheads nearly touching the floor. "Successor!" they echoed, their voices small and frantic in the sudden, suffocating silence.
Ritsuzen Kaguya's gaze lingered on the boy to the side for a heartbeat longer than necessary before her eyes flicked toward the huddle of shaking boys.
"Leave."
The word was intoned with a melodic, crystalline coldness that felt less like a suggestion and more like an executioner's blade resting against their necks. The sheer weight of her presence turned the air into lead, making it clear that their continued existence in her sight was a debt they couldn't afford to pay.
"Yes!" Riku's group echoed in a frantic chorus before scrambling to flee.
The forest didn't relax with their departure. Leaves hung motionless in the air, as if afraid to rustle. Even the insects had gone silent, their instinct screaming that a predator far above their place in the food chain had arrived. Only when Kaguya's gaze shifted away did the woods dare to breathe again.
**********
Their terror came not just from the suffocating weight of her mana, pressing on the forest as if gravity had grown heavier, but from what it represented. Every year, the Ritsuzen clan forced its unmatured members to prove their progress. There was no room for weakness: those who grew were granted richer resources to push further, those who stalled were consigned to the clan's unspoken blacklist, and those who regressed were stripped of mana and cast back into the mundane.
And recently, Kaguya's own trial had shattered every precedent the clan held.
Sealing magic was supposed to be an art of patience, a discipline that took decades to master. Yet she stepped into the arena and, with a single fluid gesture, collapsed the ambient mana into a microscopic point. She didn't just form a seal, she erased mana itself. The air didn't merely fall still; it became a vacuum. The mana that normally saturated the Ritsuzen training grounds vanished, swallowed into the palm of a girl who hadn't even hit her growth spurt. For three full seconds, there was no magic in the world at all—only Kaguya.
Riku and his group had watched from the front row as the roaring spirit-beast summoned for the demonstration fell silent mid-screech. Its head didn't burn or break; it simply vanished, locked inside a geometric prison of cold light that Kaguya held between two fingers. The Elders didn't hesitate. They abandoned centuries of tradition and named her Successor on the spot.
**********
Back in the woods, the sudden vacuum left by Riku's frantic retreat made the silence feel even heavier. Kaguya turned her attention back to Ren, her gaze unreadable.
He had seen Kaguya cold before; she had always been distant, aloof, unreachable. But this was different. This wasn't the quiet chill of her usual indifference; this was a crushing, suffocating force that made his instincts scream at him to kneel. For the first time in his life, Ren felt genuinely afraid of his sister.
Ren stood frozen, heart pounding. She was the same sister he knew, but the pressure rolling off her was nothing he'd ever felt before.
He tried to take a step toward her, but his boots felt as though they were made of lead. The 'Successor's' aura wasn't just a feeling; it was a physical barrier that vibrated against his skin. Every time he breathed, it felt like swallowing glass. He looked at her hands, expecting to see a weapon, only to realize her presence alone was the blade.
"Umm…" Ren then swallowed, the air in his lungs suddenly thin. "Th-th-thank you, sis—"
The word caught in his throat. He forced himself to correct it, stumbling over the title he'd barely learned to say.
"—Successor," he finished, bowing his head.
Silence stretched between them. Up close, the "gravity" of her mana pressed on him even harder. A jolt of fear ran through him as he realized he didn't even know if he was allowed to call her "sister" anymore, not after what he'd just witnessed.
On the ground, the silver fox, Kon, was no longer the brave protector. He curled into a shivering ball, muttering weakly, "Mo-monster…"
As if the small voice acted as a trigger, Ritsuzen Kaguya jolted. She immediately reined in her overwhelming aura, the crushing pressure vanishing as quickly as it had appeared. Her crimson eyes, fixed on Ren, dimmed. For a fraction of a second, a flash of raw guilt flickered in her gaze before the mask of coldness slammed back into place, a transition so swift that neither Ren nor Kon caught it.
Kaguya parted her lips to speak, but the words seemed to catch in her throat. Instead, she turned, her long silver hair swishing like a blade as she began to walk away.
"The weak should stay where they belong," she called out, her voice a melodic chill echoing through the trees. "Do not wander where you do not fit." She paused, her silhouette framed by the shifting shadows of the woods. "Forget mana. Forget spiritual power. The moonlit world is never kind."
Ren watched her go, a bitter smile tugging at his lips. He wanted to argue, but the words felt hollow. How can the sun ever understand the loneliness of the moon, drifting in the cold distance?
Kon sensed his young master's despair and trotted over, patting Ren's leg with a small paw. That simple touch felt like a jolt of electricity. This small spirit, his constant companion since birth, was the only light in Ren's darkened world, the sun that gave his moon a reason to shine.
Ren's hand tightened into a white-knuckled fist. The bitterness in his chest ignited into a roar.
"NO!"
The shout tore through the clearing, stopping Kaguya in her tracks.
"Why should the weak be forbidden from chasing power? I want power! I want to protect Kon! I'm done being a burden! I'll master spiritual power until no one dares look down on me again! Every day, I'll train until I break! And who cares about your lame magic anyway!"
His internal scream had erupted into a hot-blooded roar. Kaguya stood perfectly still, her back to him.
"He's grown…" she whispered, too softly for him to hear.
"Suit yourself," she replied aloud, her tone indifferent as she finally vanished into the foliage.
Kon looked up at his young master in wide-eyed wonder, his head tilting cutely. Then, realization struck like a lightning bolt.
"Waaaaah! Ren-chan has finally come to his senses!" the fox wailed, tears streaming down his furry face. "Uuuu... Madam in heaven can finally rest in peace! Her son is finally growing up! Uwaaaaa!"
**********
Ritsuzen Kaguya was, in secret, a soul bound entirely to her brother. In the frozen, clinical wasteland of the Ritsuzen estate, Ren was her only emotional anchor. Without him to ground her, Kaguya would have snapped years ago, likely ending in a bloodbath of her peers before the Elders could put her down.
There was a cruel irony in their lineage. Every few decades, the Ritsuzen clan, a family that pursued power through the total suppression of emotion and the worship of absolute logic, produced a "High-Emotional" child. These children were born with the exact potential the clan coveted, yet they rarely realized it. Most shattered under the pressure, their minds breaking before their power could truly blossom.
Kaguya was the anomaly, the one who had not yet shattered. If she remained whole, it was only because of her brother's presence. From a distance, she gathered the small, mundane pieces of his life like precious embers: the sound of his laughter, the focused intensity of his face when he read, and the way he huffed cutely at his familiar. These were the fuels that kept her heart from freezing over, the only things preventing her from snapping under the clan's weight.
That need for warmth, not ambition, was what drove her. She hadn't fought to become the Successor out of a desire for power; she did it out of a desperate, childlike hope. She believed that if she could transform herself into the perfect weapon, the peerless, untouchable heir, she might finally earn the one thing the Ritsuzen never gave freely: her father's love.
But that fragile hope was shattered on the day of her demonstration.
Even after she obliterated the clan's records, sealing and slaying the summoned spirit-beast in a time that should have been impossible, her father's gaze never softened. His eyes, a crimson mirror of her own, remained flat and hollow. He looked at her not with pride, but with the cold detachment of a craftsman inspecting a tool that had performed exactly as expected.
When the Elders rose in a unanimous vote to name her the Successor, her father remained silent. He didn't interject, didn't nod, and didn't offer a single word of acknowledgment. His silence was a vacuum that sucked the air out of her lungs.
For a heartbeat, she felt her vision blur. The arena, the Elders, the applause, it all faded into a distant hum. If even perfection wasn't enough… then what was left of her to give? A hollow ache spread through her chest, sharp and suffocating, as if her ribs were collapsing inward.
In that moment, Kaguya's mind had nearly fractured. The realization that perfection still wasn't enough was a weight more crushing than any seal she had ever cast. It was only the thought of her brother, the warmth of his existence waiting for her back at the estate, that kept her from snapping then and there.
This was why she had been there, hidden in the shadows of the woods. She had been drinking in the sound of their laughter, the fox's frantic attempts to convince Ren to train, and Ren's stubborn, light-hearted refusals. These small, mundane interactions were her lifeblood. They were the only things that kept her world from turning entirely to grey.
Her blood had boiled the moment those nameless punks dared to corner him. She had watched with a sneer as the one called Riku attempted to strike him; the boy was a dullard, unable to even comprehend a human's capacity for agility.
'Heh. Fool.'
She had intended to stay in the shadows, but the moment Riku ordered his goons to restrain her brother, a line was crossed. In an instant, she had descended, her aura flaring with a cold, unrestrained fury that brought the punks to their knees. But even in her rage, she felt a pang of regret, the pressure had been too much, scaring Ren and his little fox.
'Hmm. Sad.'
Even the harsh words she threw at him were a shield, a desperate attempt to keep him far away from the blood-stained world she inhabited.
'I'm protecting him. I swear!'
And yet, his roar of defiance had been a revelation. He had grown.
'He will forgive me... right?'
She bolted the door, the heavy iron lock clicking into place, the only sound that allowed her to breathe. She tore off the formal over-robe, letting it fall to the floor like a discarded skin. Her hands were shaking. The coldness she projected to the world was a mask that took every ounce of her strength to hold, and now, in the dark, she could finally let the cracks show. Safe within the confines of her private room, the "Successor" was gone. The girl with her eyes glowing crimson clutched a shirt her brother had worn to sleep, pressing it to her face.
"Aaaaahh… sniff… my brother," she whispered, her voice trembling with a terrifyingly soft devotion. "How your scent comforts me…"