The Ritsuzen clan did not raise children; they processed assets.
To the Ritsuzen, emotion was a chaotic variable—a noise in the signal of pure intellect. To cultivate absolute logic, the clan followed a tradition of "Emotional Starvation." From the moment a child took their first breath, they were denied the luxury of warmth, the comfort of a soft voice, or the security of a mother's embrace. A child who never knew love would never be blinded by it. By stripping away the heart, the Ritsuzen ensured that the mind would become a cold, calculating machine, sharp enough to cut through the very fabric of reality.
By all rights, Ritsuzen Ren should have been the hollowest of them all.
Born with an abysmal mana pool and discarded by his father, Ren was left to rot in the unheated corners of the manor. The clan didn't even bother to "cultivate" him; they merely sustained his most basic needs and then ignored him, leaving him to be consumed by the numbing silence of the estate.
He should have been hollow. If not for Kon, the one presence that kept his heart from freezing entirely.
**********
Inside a cramped room tucked away in the Ritsuzen estate, a boy with short black hair and a delicate appearance sat at a scarred wooden desk. He faced the window, allowing the pale sunlight to illuminate the book he was perusing, a borrowed volume from the library titled The Theory of Mana.
The book, much like the residents of the estate, was bland and lifeless, a desert of dry text and rigid theory.
"Ne, Ren-chan, stop looking at that book! It's sooooo boring," a cheerful voice chirped.
A small silver fox spirit bounced restlessly on the bed, its tail flicking like a flame. "Let's go out and play! The weather is too nice to waste on old paper."
"Kon, not now," six-year-old Ritsuzen Ren said softly, his voice steady despite the distraction. "I am researching."
"Ugh! What is there to research?" Kon whined, performing a dramatic flop onto the mattress. "It's not like reading will make your mana pool grow, anyway. Why don't you just give up on mana and embrace spiritual energy instead?"
The fox spirit rolled onto its back, peering at him with bright eyes. "You've been precocious since… well, since the moment you were born! I'm sure your spiritual energy is immense." Kon caught himself mid-sentence; it felt inane to say 'since you were a child' when the boy was still so small, yet Ren's focused intensity made it easy to forget his age.
Ren paused in his reading, his finger hovering over a line of dry text. He hesitated for only a heartbeat before replying firmly, "The Ritsuzen are a clan of magicians. It is only right to focus on magic."
"Eeek! So rigid!" Kon cried, his tail thrashing against the mattress. "What's the point? They will never acknowledge you anyway. Are you still trying to impress that stony blockhead of a father, or that doll-like sister of yours?"
Faced with Kon's blunt truth, Ren's "research" came to a sudden, jarring halt. He closed the book with a slow, deliberate calmness, but when he turned his head, the mask of the Ritsuzen had shattered. Large, pearlescent tears were already spilling over his lashes and rolling down his cheeks.
"Waaaahhh! Kon, why are you being so mean!"
Ren lunged, pouncing on Kon and squishing the soft fox spirit into a protesting little ball of fur.
"Reeeeeen!!! Stooooooop!!!!" Kon cried out, his voice muffled by the mattress.
After venting his frustrations for a few moments, Ren finally released his grip. He sat back, wiping the stray tears from his face with the back of his hand. "Sniff…."
"Sigh…" Kon let out a long, dramatic breath of relief, slowly reinflating as he shook out his ruffled silver fur.
"...Let's go..." Ren mumbled, his voice barely a whisper.
"Hmm?" A row of invisible question marks seemed to sprout over Kon's head. The silver fox tilted his head with exaggerated cuteness, staring up at the stubborn boy.
"Out..." Ren repeated. A faint blush crept across his cheeks as he pointedly ignored Kon's confusion. Without waiting for a response, he turned and marched out of the room, finally surrendering to the fox's plea to go out and play.
**********
Beyond the grey stone of the Ritsuzen estate, but still safely within the shimmering perimeter of the clan's bounded field, a boy and a fox danced through the woods Okutama.
The ancient trees provided a canopy of deep greens and shifting shadows, a world away from the lifeless corridors of the manor. A golden wisp of flame flickered between them, weaving through the air with a life of its own. It ducked and dived, intelligently dodging the boy's grasping hands as if it were playing a game of tag.
"Hahahaha! Ren, look at this!" Kon boasted, his eyes gleaming as he manipulated the fire. "This is a spiritual flame. See? It's so much more fun than that boring Ritsuzen magic!"
Deep down, Ren thought so, too. The warmth of the spirit-fire was a stark contrast to the cold stone of his room. Yet he still managed a stubborn huff, crossing his arms. "Hmph! You haven't even seen real magic!"
It was a hollow boast. Ignored since the day he was born; Ren had rarely seen the clan members perform any spells at all. On the rare occasions he had caught a glimpse, their magic was clinical and restrained, never as vibrant or flashy as the golden flame dancing before his eyes.
"Bleghhh, all that magic with numbers and calculations? Boring." Kon stuck out his tongue at Ren. "Look at me, I just feel the spiritual fire, and it listens."
To prove it, he flicked his paws.
A thin ribbon of spiritual flame zipped past Ren's ear with a sharp whoosh, then hovered behind him like a mischievous fire sprite. Kon grinned as he made it swell to the size of a melon, then shrink down to a flickering ember no bigger than a candle flame.
"Woah—!"
In that moment, the dry theories of his library books were forgotten. Time began to slip away in a soft blur—Ren, caught in a rare trance of awe, and Kon, emboldened by the attention, spinning increasingly intricate patterns of fire to impress his young master. They lingered in that small pocket of warmth until the vibrant greens of Okutama began to deepen, the sky dimming with the quiet approach of evening.
"Whew—!" Kon wiped imaginary sweat from his brow with his paw in an oddly human gesture. Exhaustion tugged at his voice, but he still managed a smug grin. "Well? Are you ready to learn spiritual power yet?"
Ren, just as worn out from chasing the flame around, squatted with his hands braced on his knees. He looked up at Kon's expectant face and huffed stubbornly. "No."
A cluster of black lines practically formed over Kon's head. So, all that showing off was for nothing? He sighed internally, speechless but not surprised. This exact exchange had happened so many times he'd lost count.
Seeing Kon's slightly disappointed expression, Ren felt a pinch of guilt. He turned his head away, scratching his cheek. "Well… maybe you can teach me a little. After my daily research." A faint blush coloured his face.
Kon froze. His eyes widened. "Really? You'll really learn!?"
Ren nodded, voice barely above a whisper. "Umm… yeah."
"Woohoo!" Kon exploded into excitement, leaping into the air and bouncing in circles around Ren like a hyperactive flame sprite.
Kon's boisterous celebration continued for a while, with Ren watching the fox's antics in speechless amusement. However, the light-hearted atmosphere was suddenly shattered by a voice interjecting from the shadows of the trees.
"I was wondering what all the noise was. So, it's just the mongrel and his mutt."
The arrogant voice echoed from their right. A group of boys, a year or two older than Ren, emerged from the brush. Their leader stepped forward, his lips curled into a faint, practiced sneer. The others followed suit, their expressions mirroring his condescension as they looked down at Ren. To them, Ren wasn't a cousin or a brother, he was a flaw in the Ritsuzen lineage.
"You—!" Kon snapped, spinning around to glare at them, his silver fur bristling in anger.
Despite the clinical way the Ritsuzen raised their young, the human instinct for connection was difficult to fully extinguish. Even here, children would huddle together, forming small, exclusive groups to scavenge whatever scrap of warmth they could find from their peers.
"Hmph! The mutt should keep quiet when the humans are speaking," interrupted the leader of the group, Ritsuzen Riku.
His voice was clipped and clinical, reflecting the pro-human supremacy that rotted at the core of the clan's philosophy. To the Ritsuzen, spirits were not companions or equals; they were either fuel to be consumed or noise to be silenced.
Riku stepped closer, his gaze drifting from the bristling fox to Ren. In his eyes, there was no childhood wonder, only the chilling, judgmental stare of a supervisor inspecting a broken machine.
"Hey! You take that back!" Ren shouted, his small fists clenching at his sides. He stepped forward, squaring his shoulders against the older boy with a defiance that defied his delicate appearance.
"Ho? A mongrel dares to oppose his superior?" Riku's voice remained unnervingly even. "Very well. I've just learned a new spell from the elders. Let me test the output. Be grateful, you are the first to witness it."
Riku raised his right hand. In the air before him, glowing mana lines began to trace a precise geometric circle. He began the incantation in a rapid-fire string of cold variables.
"Ambient temperature: 22.4°C — within acceptable variance. Oxygen concentration: 20.95% — stable. Mana vector: coordinates (x=0.12, y=−0.03, z=1.00) — normalized. Thermal coefficient: λ = 3.7 — confirmed. Boundary conditions: fixed. Solution state: convergent. Combustion sequence… Initiate"
A fireball began to manifest at the centre of the magic circle. It wasn't a wild flame; it was a perfect, contained sphere of heat that hummed with artificial precision. The group of boys behind Riku watched with a cold, muted interest. Only a slight glimmer of awe touched their eyes—the hollow, technical appreciation of a high-level calculation successfully executed.
"Ren! Stay back!" Kon shouted, his voice sharp with vigilance.
The little fox spirit's heart sank. He had spent the bulk of his spiritual energy on his earlier demonstration, and while Ren's natural reservoir was vast for his age, the boy hadn't yet been trained to tap into it.
Without that training, the bridge between them was closed. Ren was a locked vault of potential, unable to supply his shikigami with the fuel needed to manifest a defence. Kon stood alone before the humming fireball, his own energy flickering low, tensing his small frame to use his body as a shield for his young master.
Then, Ren, alarmed by the heat, simply jumped out of the way.
A sudden, heavy silence spread through the woods of Okutama. Despite the Ritsuzen always crowing about their flawless logic, they could be remarkably single-minded, especially a child who had only just mastered the technicalities of a spell. Riku, in all his cold self-satisfaction, had calculated the variables of oxygen and ignition, but he had never factored in the possibility that Ren would simply refuse to stand still.
Kon, hovering in mid-air, felt like a fool. The simple-minded fox spirit had been ready to sacrifice himself, only to realize his master was already five feet to the left.
Riku's face flushed a dull red, a rare crack in his clinical mask. Humiliation turned to a stuttering rage. "G-go and restrain him!" he barked.
The group of cronies looked at each other, hesitating. Their eyes darted from the retreating Ren to the active, humming fireball still hovering in Riku's palm.
"This..." one of them muttered, trailing off. They weren't moving. They feared that if they lunged for Ren and restrain him, they would be caught in the explosive radius of the very spell they had just been admiring.
Just then, a calm, melodious voice drifted from the shadows behind the group. "Hmm? What is going on here?"
The boys froze. Ten-year-old Ritsuzen Kaguya stepped into the clearing, her presence demanding immediate silence. Though only a few years older than the others, the clan head's daughter, and Ren's half-sister already carried herself with an unnatural poise. She had already developed that distinctive Ritsuzen aura: a cold, commanding stillness that could suppress a room without a single shouted word.