The King decided to make a bento.
Not merely a meal, but a theory.
A tamagoyaki built on the golden ratio. Meticulously calculated placement. Structural integrity maintained even after cooling. The result is delivered directly to Seto Kaiba's desk.
Unfortunately, Kaiba Corporation is wholly unprepared for the sight of its CEO eating a handmade lunch.
Employees speculate. Rumors spread. People cry for reasons they cannot adequately explain.
Meanwhile, in the afterlife, the priests of the underworld have become convinced that the King's bento is a sacred artifact worthy of religious study.
Is it love or logic? Science or divinity?
Neither Kaiba nor Atem seem interested in making that distinction.
After all, the real problem is that two brilliant men keep trying to explain affection as a reproducible scientific phenomenon.
The Golden Bento Theory has entered the testing phase.
This is a translation of an original work on Pixiv.
Original Title: 愛と理論 03 王、弁当を作る
Original Author: 葉人(@Hathor₋yuki)
Personal site: https://prideshipping.sakura.ne.jp
The wide kitchen was full of steam and the smell of something cooking. Atem was putting to use the skills he'd picked up during their stay-at-home date. His knife work had become reasonably presentable—but the movements still carried the solemnity of a ritual.
"…That level of burning exceeds acceptable limits."
Seto appeared with the news, and noted it without inflection.
Atem didn't look up.
"It's not burned. It's the result of calculation."
"Calculation?"
"Heat level, oil absorption rate, egg mixture viscosity. I accounted for all of it. Golden ratio."
"Don't apply the golden ratio to tamagoyaki."
"Then what do you use?"
"Experience."
A brief silence. The corner of Atem's mouth curved up, his eyes sharp with provocation.
"Theory versus experience. I'll prove which wins today."
"You're challenging me?"
"Lunchtime."
Seto closed the news and smiled quietly.
"…I'll accept. My lunch is on the line."
A bento box closed without a sound. Under the lid: a world constructed to golden ratio proportions. Seto left for work with it in hand.
Lunch break.
The president's office on the top floor of Kaiba Corporation.
Something unusual had entered a space that was the embodiment of silence and efficiency. A bento box had been placed on the desk without a sound. Heavy black lacquer lid, gold clasp—practically a relic. The container might have been worth more than the contents, but to Seto, naturally, it was the other way around.
He sat down and opened the lid in silence.
A security guard in the hallway turned around for no apparent reason—because he thought he caught a faint scent. Temperature and humidity were perfectly controlled on this floor, and the ventilation system was designed with no room for leaks. Whatever had slipped through wasn't a smell. It was a presence.
"…What is this."
Seto's voice was low, but there was a trace of surprise in it.
A tamagoyaki gleaming in gold.
Grilled salmon with a restrained sheen.
Simmered beans. Blanched spinach with sesame.
The colors were arranged with precision—every placement geometrically perfect.
In other words: unmistakably Atem's work.
"So he actually did it himself."
He murmured it softly and picked up his chopsticks.
Normally the president's lunch was brought to him. Eating in his office was routine—but today was different.
A security camera caught the president at lunch. The footage was shared, one by one, across every department—accounting, tech, the secretarial pool, the front desk.
Is that a bento?
Doesn't that look homemade?
No way… no, it can't be…
Could it be… A-Atem-san? (the best-informed person in the company)
The quiet murmur spread faster than anyone expected. Within five minutes, a thread appeared on the company's unofficial internal board, KC Internal. The office moved, in silence, toward something like panic. And somewhere in the back of every mind, there were tears. (Someone like that, for a president like him… I'm so glad…!)
【BREAKING】President's lunch is a bento (no image) 【shock】
【Analysis】Reading the structure of dominance and trust through bento contents
【Who made it debate】Atem theory gaining ground 【from a reliable source】
Seto, of course, knew nothing of this. (Or knew and was ignoring it.)
He simply moved his chopsticks and murmured to himself.
"…Even cold, the theory holds."
The theory.
The golden bento theory had been designed to withstand changes in temperature.
When Seto ate the last bite, he gave a quiet laugh.
"…You win."
Behind that small concession: satisfaction, and an abundance of something warmer.
A few days later. The afterlife.
The air was cold and still, the light diffused soft. The silence broke when a figure emerged from beyond the gate.
Seto Kaiba. The only living person who could move freely between the living world and the afterlife—and the external consultant who had built the afterlife's entire communications network.
"Afterlife duties today, starting at one. Lunch included."
He announced it flatly and moved to his work desk. But today, lunch was the problem.
Beside him sat something conspicuously out of place: a two-tiered lacquer bento box (one tier more than last time). Gold clasp. The character for King engraved on the lid.
The contents were, of course, Atem's own work.
A priest whispered in a trembling voice.
"…Is that what I think it is?"
Another answered.
"An offering from the living world, crafted by the King's own hand…?!"
A third sank to his knees in prayer.
"Seto-sama has been… chosen…!"
Meanwhile, Seto opened the bento without expression, operating his terminal at the same time.
The scent spread through the afterlife. Simmered vegetables, grilled fish, and a tamagoyaki in flawless golden ratio formation.
Silence.
The presence was so overwhelming that no one breathed. Some priests stopped breathing physically.
Seto moved his chopsticks. Every motion drew the gaze of more than a dozen priests, riveted.
"…Good."
The moment he said it, a silent scream erupted from the back row of priests.
"G-good…?! He called the King's bento good…!"
"He shared in the divine sense of taste…?!"
"The principles of the afterlife—!"
Seto exhaled deeply.
"Calm down. Flavor is the result of chemistry and structure."
"Not love?!"
"Theory."
"…! Sacred theory!"
They called it sacred—but in truth, the priests filtered everything through that single word regardless.
Then the comm device rang softly. Seto answered, and Atem's face appeared on screen.
How was it?
"Composition and arrangement: no variance. Perfect."
I see. Then the theory is confirmed.
"…Yes. Golden Bento Theory—successfully demonstrated in the afterlife."
Every priest prostrated themselves at once.
"The golden theory…!"
"So this is the fusion of love and reason…!"
"We must learn… we must learn…!"
What followed was nothing less than a bento revolution in the afterlife. A group of younger priests immediately began planning to set up a kitchen on the spot.
"We too shall apply the theory of the loving spouse's bento!"
"Loving spouse? But we don't have spouses…"
"Theoretically it's possible!"
"Theoretically?! So this is a theoretical marriage?!"
Seto pressed his fingers to his temple and sighed.
"…Atem, your influence has become a religion at this point."
It's not religion. It's logic.
"…Don't lie."
Atem laughed through the screen.
Rebuilding the afterlife requires both theory and love, doesn't it?
Seto couldn't hold back any longer—his mouth relaxed into a smile. In that instant, every watching priest understood.
"…So this is the power of the King's smile…!"
"The golden bento truly is a sacred relic of the afterlife…!"
The afterlife reformed its calendar that very day. Golden Day—the day the King's bento manifested.
Evening.
Seto came home to the Kaiba mansion. He took a quiet, wordless breath, the faint air of the afterlife still clinging to the hem of his coat.
In the living room, Atem sat in silence before a steaming mug. The lights were turned down low, their soft flicker tracing the outlines of both of them.
"…The afterlife is in an uproar."
"I heard. Apparently it's being called the King's Bento Incident."
"It isn't. Don't call it an incident. It was lunch."
"It moved people enough to be called an incident. Celebrate with me."
Seto sighed and draped his jacket over the sofa. Atem held out a cup of herbal tea. The golden surface of the liquid shifted gently.
"How was it? The taste."
"Exactly as theorized. Flavor, composition, temperature, aromatic balance. Close to golden ratio."
"Which means the Golden Bento Theory has been validated."
"…I didn't expect you to actually name it."
"A theory earns its name by being verifiable. You ate it. You evaluated it. That's the evidence."
"…What kind of king talks about love in theoretical terms."
"What kind of scientist tries to hide love in theoretical terms."
They held each other's gaze in silence for a moment, then both smiled faintly, neither first.
Beneath the surface of a conversation wrapped in logic, there was real warmth.
Atem leaned forward slightly and loosened Seto's tie—careful, unhurried, without a word. Seto didn't look away, watching the hands.
"Apparently in the afterlife they're calling it the loving spouse's bento."
"Correct them. It's a theoretical lunch."
"Heh… I doubt they'll believe the correction."
Fingertips moved from the knot of the tie to Seto's throat.
Seto's breathing paused, barely.
"…Your temperature is high."
"The afterlife nights are cold. Coming back creates a difference."
"Then let me warm you up a little."
With those words, Atem climbed onto the sofa and wrapped his arms around Seto from behind, quietly. Neither of their expressions changed. But the silence spoke of something that existed beyond theory.
"Atem… since when did you become so hands-on?"
"Once you complete a theory, the next step is experimentation."
"A dangerous researcher."
"Only with you."
Seto laughed faintly and let his shoulders relax. In the dim light, their shadows overlapped. In that quiet embrace, there was no need for science, or royal authority, or reasoning. Only one conclusion surfaced, clear and certain. In theory and in practice both—they could no longer be separated.
Morning at Kaiba Corporation.
There was, for some reason, a notice posted at the entrance to the staff cafeteria.
【Today Only: Prototype Special Bento "Golden Ratio Bento β" — Distribution in Progress (Brace Yourselves)】
Provided in cooperation with: President Kaiba & Special Advisor Atem
"…Brace yourselves for what, exactly?"
"The name of the president's Special Advisor being on it is already a warning sign."
Meanwhile, in the president's office. Seto was looking through the morning data report when he said, without expression:
"…Atem."
"What?"
"What did you do?"
"An improvement. I advanced the theory. I optimized the golden ratio for individual taste preferences."
"…You ran that experiment in the staff cafeteria?"
"To verify a theory's universality, you need sample size."
"…Are you confusing scientific research with company operations?"
"Not confusing. Fusing."
At that moment, there was a knock on the door, and Mokuba burst in looking frantic.
"Seto! This is bad! There's a crying phenomenon in the cafeteria!"
"…A crying phenomenon?"
"People are crying the moment they eat it! It reminds me of my mother and I can see an ancient desert and—"
"That's not food anymore, that's a hallucination."
"Success."
Atem crossed his arms and nodded in satisfaction.
"Success how."
"Stimulating emotion and awakening memory. That is the royal road of food."
"Your royal road causes social disruption."
"Seto, it's trending on the staff's unofficial social media too. Cried at the golden ratio bento."
"Wonderful. Let's get it trending in the afterlife."
"Don't. The afterlife is already in chaos because of your bento."
"Then an improved version—"
"No more improvements. Listen to me, Atem. Your bento theory is complete. Any further and the human stomach won't hold up."
"In that case, a taste endurance experiment—"
"No."
Seto closed the documents and exhaled deeply.
Then his eye landed on something at the corner of the desk. Gold wrapping. A small inverted pyramid mark.
"…You made one for me too."
"Of course. The King's theory exists for the King and the scientist."
"…That's a complicated way to put it, but I'll accept it."
Seto picked up his chopsticks. Atem asked quietly:
"Good. I've confirmed the cafeteria's reaction. Now it's your reaction's turn."
"…Stop treating me as a test subject."
"No—this is an act of confirming love."
Seto paused with his chopsticks and gave a reluctant smile.
"…You've been getting better with words."
"Learning is built through continuation."
"At this rate you'll be more logically persuasive than me."
"That would be a problem. You'd stop talking."
At that, Seto's hand stilled, and laughter slipped through.
The Golden Bento Theory. It was no longer merely a theory—it had become a metaphor for both their love.
Evening.
A quiet house. The sound of the front door.
Seto came home. Calling out as he shrugged off his jacket, toward the sound of footsteps:
"I'm back, Atem."
"Welcome home, Seto."
Atem must have been in the kitchen—he came out in a white dress (slightly shorter today) and an apron, looking just a little proud.
"How did it go? The golden theory."
"I can't determine whether what you're calling the theory refers to the taste of the bento or to some kind of psychological strategy in the workplace."
Atem answered without hesitation.
"Both. The improvement in concentration from taste stimulation, and the boost in staff morale from the cultural shock of the president bringing a bento. By my assessment, both were successful."
"I see. The staff's eyes were certainly unusually warm today. Some of them were moved to tears by the large-scale experiment. That's reaching a level that affects operational efficiency."
Seto settled onto the sofa and loosened his tie.
"So—that means it's my victory, doesn't it."
He glanced at Atem.
"Let's clarify the definition of victory first."
Atem smiled slightly and set a steaming mug on the table.
"You looked happy. That's the best evidence there is."
"……"
Seto picked up the cup and took a sip of herbal tea. He'd gotten used to this golden-colored tea since Atem started making it—almost without noticing.
"So you're defining your theory as a device for generating happiness."
"A theory only has meaning when it's verified."
"Then what's the next verification?"
"Tomorrow's an afterlife workday, isn't it?"
Atem's eyes glinted with mischief.
"Observing the king's subjects' reactions should be entertaining."
"…They'll collapse this time."
Seto laughed, low.
"The human world is still in an uproar just from me bringing a bento. If the priests in the afterlife see it, their sanity will break over something that's just become routine."
"Breakdown is also a byproduct of theory."
"So that's what the Golden Bento Theory is."
Back-and-forth banter. Just that—and yet warmth bled through between the words.
Seto stood up and moved toward Atem.
"…Your theory did have an effect."
"Which effect?"
"My appetite was stimulated. Or rather—something more than that."
Atem shrugged and laughed.
"That's an off-theory response."
"Off-theory."
Seto's fingers touched Atem's cheek, lightly.
"But… I don't dislike off-theory."
Atem laughed too.
"Then that's tonight's conclusion."
In the scent of herbal tea, their conversation dissolved into silence without either of them marking the moment. One touch, soundless. And then a calm night settled back in.
The silence deepened. The herbal tea remaining at the bottom of the cup gave back the moonlight, faint and pale.
Seto stood, took the empty cup from Atem's hand. No list of reasons this time—just fingers, barely touching.
"…There's still warmth here."
"The tea?"
"No. Your hand."
Atem breathed out a laugh.
"That's poetic. Not what I'd expect from a scientist."
"If a phenomenon can't be explained by logic, poetry is all I have left."
Seto held Atem's fingers, gently.
"But at minimum—this sensation has high reproducibility. I feel the same warmth every time."
"Is that what you call reproducibility of love?"
"If that's the name for it, then I recognize the value of continuing the experiment."
They laughed together. It sounded like wordplay, but every word carried real weight.
Atem pressed lightly at Seto's chest with his fingertips.
"Your theory is too composed sometimes. It's not fair."
"I only appear composed."
"Then how do you want to appear?"
Seto was quiet for a moment as if thinking, then let a smile fall.
"To you alone—running hot enough to look like I'm overheating."
Atem narrowed his eyes and answered, quietly.
"Same. You're the only one I can let go of control with."
The distance closed.
At the end of a long conversation, the lips that finally met carried a temperature beyond theory or analysis.
"…Conclusion."
"What."
"Off-theory is, after all, happiness."
"No objection."
Laughter and heartbeats overlapped, and the night deepened, gently.
Neither the afterlife nor the living world—only the midpoint that belonged to the two of them. There, the theory of love had reached completion.
The morning light was uncommonly clear.
The Kaiba mansion living room still held the quiet air of the night before. And on the table—the bento box, as before.
Seto picked it up. Atem nodded in satisfaction.
"Today's experiment is confirming constancy."
"Verifying reproducibility of the loving spouse's bento?"
"That's it. A joint experiment in science and love."
"…You're getting practiced at this."
A weighted silence between them. Both smiled faintly, as if remembering the off-theory events of the previous night.
A few hours later.
"The president again today—a bento—!"
"And it looks homemade—!"
"There's one more tier than yesterday—!"
The company chat erupted in quiet uproar. A research team had begun debating what is the theory of love, and at lunchtime the management division held a baffling presentation titled The Golden Bento Theory. Through all of it, Seto himself ate with complete calm and said, simply:
"The theory is beautiful and reproducibility is perfect."
Needless to say, that statement only added more fuel to the fire.
The royal palace of the afterlife.
"The King—! Again—!"
"He's brought a handmade offering!"
"It isn't an offering. It's a loving spouse's bento."
"What—both sacred and modern—!"
"Sacred."
The priests had completely lost their ability to process information correctly. One of the record-keepers had already begun writing a scroll titled The Equation of Love and Nutrition. It seemed the philosophical canon of the afterlife was about to be affected.
Atem watched the news and laughed despite himself.
"Neither your company nor my palace has settled down at all."
"That means the reproducibility was high."
"I genuinely didn't think it would actually become a theory."
"It's not a bad theory. If it can prove that happiness is reproducible, it has value."
Seto said it peacefully. Atem shrugged.
"Then let's form the next hypothesis. Does love deepen continuously? To verify that—"
"Long-term observation will be necessary."
Their eyes met, quietly.
Not theory. Not miracle. Just love, continuing as ordinary life.
That night, another happiness that would never be written up as a paper was added to the accumulation.
