CHAPTER 24 : The Body Betrays
Nekoma High School — June 25th, Wednesday, 11:45 AM
The first sign was the noise.
Arisu's stomach growled during second-period mathematics with a volume that turned three heads in the surrounding desks and prompted the teacher — a soft-spoken woman whose patience was legendary among students — to pause her equation and glance toward the back of the room.
He pressed his arm against his abdomen. The growl subsided. The hunger didn't.
I ate two servings of breakfast. Two. Rice, miso, grilled fish, tamagoyaki, and a protein bar on the walk to school. By any reasonable metabolic standard, that should sustain a seventeen-year-old male through four hours of classroom sitting. My stomach disagrees.
The hunger had been escalating for a week. Not the gradual increase he'd tracked since the system's activation — the slow climb from normal portions to larger portions to supplemental protein bars that he'd attributed to increased training demands. This was different. This was the body asking for fuel with an urgency that suggested the engine had been upgraded without consulting the pilot.
[Zone Architect] Metabolic Assessment complete. Current caloric intake: ~3200 kcal/day. Recommended intake for system-optimal training load: 5500-6000 kcal/day. Deficit detected. Performance degradation projected if sustained.]
The notification arrived between the teacher's explanation of quadratic functions and the assignment of practice problems. Arisu acknowledged it with a mental flick and opened his bento under the desk.
Six thousand calories. That's roughly double what I've been eating. Triple what a normal teenager consumes. The system is drawing resources — Court Memory's spatial processing, the expanded zone radius, the passive data feeds that run constantly during practice — and the body's fuel supply can't keep up.
Yesterday's third prep match confirmed it. Level eight triggered after the match — Court Memory and dual marks unlocking, the zone expanding to eight meters, Tier 2 rules becoming accessible. The level-up came with the standard stat boosts, the MS pool climbing to fifty, and a metabolic assessment notification that informed me, with the system's characteristic clinical detachment, that I was starving.
He ate the bento during the problem set. Rice, chicken, vegetables. The classroom noise covered the chopstick sounds. His stomach accepted the food the way a furnace accepted kindling — consumed, insufficient, requesting more.
Afternoon Practice — 3:30 PM
The hunger had been manageable through the morning. By practice, it was structural.
Arisu's first serve of the warm-up drills felt wrong. Not mechanically — the toss was correct, the contact on the palm heel was clean, the follow-through tracked along the kinetic chain. But the power behind it was diminished. The ball crossed the net with less velocity than usual, landing five feet shorter than his average zone.
Caloric deficit. The body is rationing energy because the fuel supply isn't matching the demand. Serves are the most power-intensive fundamental — the first thing to degrade when the tank is low.
His receives were late. Not by the half-second that indicated system drainage or the full second that meant total depletion — by a quarter-second. The margin between "prepared" and "catching up." His footwork, usually precise from months of drilling, felt like it was operating on a slight delay, as if the neural pathways that connected his brain to his legs were running through thicker wire than usual.
Kuroo sent a spike at him during the blocking drill. Arisu read it — cross, position five, the same approach Kuroo had used in the first blocking lesson that felt like another lifetime, back when Arisu had blocked four out of thirty-seven and learned that deception was the foundation of everything. His hands went up. The timing was right. But his jump peaked two inches lower than it should have, and the ball grazed his fingertips instead of meeting his palms.
Two inches. That's the caloric deficit converting into physical output. The system doesn't fuel the body — it augments the body's capabilities. But if the body is running at seventy percent because the engine doesn't have enough fuel, the augmentation sits on top of seventy percent instead of one hundred.
[Zone Architect] Physical performance: 72% of baseline. Caloric deficit impacting PWR and END. MS unaffected. Advisory: increase caloric intake.]
The system's recommendations and my bank account are having a disagreement. Six thousand calories daily on a high school student's budget requires either a part-time job, a wealthy benefactor, or the ability to photosynthesize.
Practice break — 4:15 PM
The vending machine in Nekoma's hallway offered rice balls, bread, sports drinks, and a selection of protein bars at prices that made Arisu's wallet flinch. He bought four rice balls and a protein bar. Stood in the hallway eating them with the mechanical determination of someone refueling a car rather than enjoying a meal.
The second rice ball was halfway to his mouth when Kuroo rounded the corner.
The captain stopped. His eyes tracked the collection of food in Arisu's hands with the rising-eyebrow expression of someone who'd observed something worth commenting on. "Are you stress-eating or training for a competitive eating contest?"
"Athletic nutrition." Arisu swallowed. Cleared his throat — the unconscious pre-lie tell he'd never managed to eliminate. "I've been reading about caloric demands for volleyball players at the national level. Five to six thousand calories daily for peak performance during intensive training periods."
It was technically true. He had read about it. The reading had been prompted by a system notification rather than a sports science article, but the information itself was accurate.
"Five to six thousand." Kuroo's tone carried the particular flavor of skepticism that meant he was entertained rather than suspicious. "That's for players who train six hours a day and have nutritionists building their meal plans. You train three hours and eat convenience store rice balls."
"Adaptation period," Arisu said. "The body adjusts to training loads incrementally. I'm trying to stay ahead of the curve."
Yaku appeared from the gymnasium door. His eyes found the rice ball collection and his expression went flat. "That's for people who actually train at the elite level, Misaki. Not first-years who've been playing for two months."
The cover holds. Barely. Athletic nutrition is a plausible explanation for a first-year who's been training intensively. But Yaku's comment carries the specific edge of someone who's been watching sports science fads come and go for years and has little patience for shortcuts.
"I'll start smaller. Build up." Arisu ate the third rice ball.
Lev arrived — Lev always arrived, drawn to food and conversation with the gravitational inevitability of a very tall satellite. "Five thousand calories? How much food is that?"
"Approximately eight bento boxes," Arisu said.
"EIGHT? I could maybe do six. Maybe seven on a good day."
"This isn't a challenge, Lev."
"Everything is a challenge." Lev took the last rice ball from Arisu's hand with the casual thievery of a training partner who'd shared food on a hundred post-practice evenings. "I'll start training my stomach tomorrow."
Yaku pinched the bridge of his nose. "Don't encourage him."
The cover story holds because the underlying claim is legitimate — athletes DO need more calories during intensive training. The quantity is what's unusual. And the explanation for WHY is the part I can't share: the system is processing spatial data through Court Memory, running expanded zone calculations through an eight-meter radius, maintaining passive awareness feeds that consume neurological resources that the body pays for in calories.
Or simpler: the engine got bigger and needs more fuel, and I can't tell anyone why the engine got bigger.
Convenience Store — 6:20 PM
The parking lot of the FamilyMart two blocks from Nekoma was lit by fluorescent tubes that hummed at a frequency Arisu could feel in his teeth. He stood under the awning with a plastic bag containing: two onigiri (salmon), one onigiri (tuna), a protein bar, a chicken bento, a carton of milk, and a banana that had been optimistically labeled "fresh" by whoever had stocked the fruit section.
He ate standing up. The bento first — methodical, fuel-focused, the chicken disappearing in measured bites that his jaw processed while his brain ran the caloric arithmetic. Approximately eight hundred calories in the bento. Three hundred in the rice balls. Two hundred in the protein bar. One hundred in the milk. Fifty in the banana.
Fourteen hundred calories consumed since practice ended. Today's total: approximately forty-two hundred. Still short of the system's recommendation by eighteen hundred. And the hunger is still here — not the sharp demand of an empty stomach but the deep, structural request of a body whose baseline metabolic rate has shifted upward by a factor the caloric supply hasn't matched.
He ate the second onigiri. The tuna filling was cold and slightly too salty and it tasted like exactly what it was: convenience store fuel consumed in a parking lot under bad lighting by a teenager whose body was running a supernatural optimization protocol that had opinions about macronutrient ratios.
The budget problem is real. My allowance covers normal eating. It doesn't cover double-normal eating. The convenience store raids add up — three hundred yen here, five hundred there, the cumulative cost of feeding a system that doesn't issue expense reports.
Solutions: one, increase allowance (requires explanation to mother). Two, find free or cheap calories (school cafeteria, team meals, bulk rice). Three, part-time job (time commitment conflicts with training). Four, eat less and accept the performance degradation.
Four is not an option. The system's assessment said seventy-two percent performance at current intake. In match conditions, seventy-two percent is the gap between winning and losing, between a clean receive and a missed one, between a call that arrives on time and one that arrives too late.
Option two. Bulk rice. My mother buys ten-kilogram bags from the market. Rice is approximately 130 calories per 100 grams. A kilogram of cooked rice is roughly 1,300 calories. If I eat an extra kilogram of rice daily — which is approximately three additional rice bowls — I close most of the deficit for minimal cost.
The cover story writes itself: growth spurt plus intensive sports training. My mother already commented that I've been eating more. Adding three bowls of rice to daily intake is a visible change but not an inexplicable one for a teenage boy who practices volleyball four hours a day.
He finished the milk. Folded the carton flat. Put the trash in the bag and the bag in the bin with the precise movements of someone managing a supply chain rather than cleaning up after dinner.
Misaki Residence — 9:30 PM
The bathroom mirror showed the same face he'd been looking at for two months. Same features. Same build — average height, average shoulders, the unremarkable physique of a first-year who'd been athletic for two months rather than a lifetime. No visible changes.
But the body under the surface was different. Not dramatically — not the anime transformation sequences that turned scrawny protagonists into muscled warriors overnight. Different in the way that mattered: the forearms were denser, the calves were harder, the shoulders carried practice weight without protesting. The changes had been incremental. Daily. Invisible unless you tracked them, which the system did and which Arisu didn't bother to because the numbers were less important than the function.
No visible changes. But the shirt I bought three weeks ago is tighter across the chest. The scale — when I checked, out of curiosity rather than vanity — reads four kilograms heavier than Day 1. Four kilograms in two months. Half of that is probably water weight and glycogen storage. The other half is muscle that grew from six thousand serves and uncounted receiving drills and blocking sessions with Kuroo and running drills and the daily accumulation of physical work that the body converts into adaptation.
The system didn't build this. Training built this. The system optimized the training — zone rules that forced better positioning, fundamental resonance that rewarded proficiency milestones, a dream interface that let me pattern-train without physical fatigue. But the muscle is mine. The calluses are mine. The four kilograms are mine.
And apparently, those four kilograms and whatever the system is doing underneath require six thousand calories daily to maintain.
He closed the bathroom mirror. Walked to his room. The training notebook sat on the desk, open to the four-column system he'd built over the past week: Canon says, Reality is, Observed live, Kenma reads.
Below the columns, a new section: Body log. Weight. Caloric intake. Performance metrics. The data points of a body that was changing on a schedule Arisu hadn't set and couldn't fully control.
[Zone Architect] Court Memory: 3 courts catalogued (Nekoma gymnasium, Tournament Venue B, Ichinose gymnasium). Accuracy bonus: +5% on familiar courts. Dual Mark capacity: 2. Tier 2 rules: accessible.]
Court Memory means every court I play on gets catalogued permanently. Three courts already. Each one is a tactical advantage — the system remembers the dimensions, the dead spots, the lighting angles, the floor grip coefficients. Playing on Nekoma's court — MY court — now carries a five-percent accuracy bonus on top of everything else.
Dual marks means two opponents tracked simultaneously. Against Karasuno, that means Hinata AND Kageyama marked. The quick attack monitored from both ends — the setter's delivery AND the spiker's contact.
And Tier 2 rules... Delayed Reveal. The ball appears to follow one trajectory, then shifts. Available because my serving proficiency is at sixty percent. A serve that looks like it's going zone one and then breaks to zone five. Not Curve Nudge's five-degree deviation — a full trajectory disguise.
The system is growing. The body is growing. The caloric demand is the price for both, and the price is denominated in rice bowls and convenience store trips and a budget that's going to need restructuring.
His phone buzzed. Kenma.
Summer schedule posted. Double practices start July 1st. Nekomata wants extended scrimmage sets in the afternoons.
Double practices. Twice the physical output. Twice the caloric demand. On a body that was already running a deficit at the current training load.
Arisu opened the kitchen cabinet. The ten-kilogram rice bag was three-quarters full. He measured out an extra portion for tomorrow's breakfast and set the rice cooker's timer.
Six thousand calories. Double practices. Summer training. Interhigh preparation. And somewhere underneath all of it, the system is building something I can't see yet — running a metabolic assessment that says the body needs more fuel for processes I haven't been briefed on.
The math doesn't lie. The engine needs feeding. And the only currency the body accepts is rice.
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