Multi Dimension Shop

Late evening light slanted through the shop windows, painting the tidy aisles in soft orange. Takashi leaned against the counter, flipping through the System's catalogs of bizarre merchandise. After his first successful transaction with Rin Tohsaka, he felt an exhilarating rush. He had not only earned his very first Shop Credits but also glimpsed the possibility of forging unique relationships with powerful characters from infinite anime realms.

Yet, excitement aside, Takashi recognized the dangers. Rin had warned him: if someone truly fearsome found their way in, they might try to seize what they wanted. Despite the System's assurance, the notion was enough to send chills down his spine. Still, the "System Shop" had stated repeatedly: **Within these walls, Takashi is protected.** 

He tested that intangible feeling earlier—a sort of invisible shield that threaded through the air, emanating from the door's swirling energies. The System had once explained, in its monotonous voice, that any harm aimed at the Shopkeeper would rebound. In short, Takashi was "invincible" here. But what about outside these walls? He sighed. The real world was no safer than the realms beyond. For now, though, he would take small comfort in the fact that no one could so much as scratch him while inside the shop.

**Ding.** 

A faint chime rang through the store—a sign that the dimension door stirred again. Takashi straightened, adrenaline spiking. "So soon?" he muttered, heart pounding. That intangible swirl of cosmic presence flared up in the back room. Slowly, the antique wooden door—blemished with strange glyphs that had appeared after his reincarnation—began to glow.

He stepped from behind the counter, each breath both anxious and thrilled. What sort of visitor would this be? Another mage? A swordsman? A spirit? The possibilities reeled in his mind.

The door creaked open. Instead of the rich, dramatic portal of swirling lights from before, Takashi caught a glimpse of a dark forest sky dotted with stars. A figure stepped through, dressed in black from head to toe. The newcomer's face was partly shadowed, but Takashi recognized, with a lurch of surprise, the distinct hairstyle—spiky black locks that hung slightly over an intense gaze, parted by a single headband. 

**Sasuke Uchiha**, from the Naruto universe.

Takashi had watched every major arc of that anime in his previous life, so he knew well the young ninja's presence: cold, brooding, and dangerously focused. Sasuke moved like a cat poised to pounce, scanning the interior with cautious eyes. Instantly, Takashi felt the tension in the air shift.

"Where… am I?" Sasuke asked, his voice low and guarded. His Sharingan wasn't activated, but those dark eyes darted around, analyzing every detail. 

Takashi cleared his throat, recalling the usual script. "You're in my shop," he began carefully, raising his hands in a gesture of peace. "A place that exists between worlds. My name's Takashi, and I'm the proprietor here."

Sasuke's features remained impassive, though he exhaled a quiet hum of curiosity. "A… shop? This is no ordinary store." He tilted his head slightly, as if listening to the subdued humming that emanated from the dimension door behind him. "I was following traces of energy from a jutsu I'd never seen. It led me to this door, and I ended up here." His eyes narrowed. "You… are a shinobi?"

"No, not quite," Takashi said with a short laugh. "I'm just a shopkeeper. But I can offer you things from across infinite worlds—items you likely won't find anywhere else. Weapons, potions, technology… everything has a price." He repeated the motto with practiced calm, trying not to show the wild flutter in his chest.

Sasuke's posture changed ever-so-slightly. Words like "weapons" and "technology" piqued his interest—particularly in a time when he was always searching for an edge, to hone his powers beyond the scope of normal shinobi. "Huh," he grunted. "And what could you possibly have that's worth my attention?"

Takashi's lips twitched in a small smile. "Well, for instance…" He gestured to a sealed glass cabinet along the wall. Inside, a short blade glinted with a faint blue sheen. "That's an advanced ninjato—modified using technology from a futuristic dimension. It's lighter than steel but can channel chakra more efficiently. It can even withstand lightning-based jutsu without breaking."

Sasuke stepped closer, eyes drawn to the subtle glow that reminded him of Chidori sparks. "You're saying it can handle my… techniques?" A spark of interest flickered in his gaze.

"Absolutely," Takashi confirmed. "You could channel your lightning release through that blade, amplifying it in a more stable form. Sort of a synergy effect."

For a moment, Sasuke's face betrayed a hint of intrigue. But he quickly shuttered it away, returning to his usual guarded expression. "And what's the catch?"

**"There's nothing free; everything has a price,"** the System's words rang out—a faint disembodied female voice that made Sasuke's eyes widen in alarm, scanning for the speaker. 

Takashi raised a reassuring hand. "That's the System. She's basically my… manager." He paused, mentally bringing up the invisible interface. "The cost for that blade is 2,000 Shop Credits, which translates to either a large amount of currency from your world or an item of equivalent value. Typically, that might be a rare jutsu scroll, or an artifact, or even knowledge unique to your clan's techniques. But you decide how you want to pay. The System will evaluate and decide if it's acceptable."

Sasuke tensed at the mention of "clan's techniques." The Uchiha secrets were not something he handed out lightly. In fact, he fiercely guarded them, especially regarding his Sharingan. "I don't suppose you'd take standard money from my village," he muttered.

Takashi shrugged. "We can convert local currency, but the sum would be large. If you have some valuable scroll or relic… or if you can produce something else that the System finds worthy, that might be easier."

Sasuke didn't like the notion of trading away his secrets. He'd come from a clan that had almost been annihilated; knowledge was all he had left. "I'll pass on revealing any secrets," he said, eyes icy. "But I might have something else." He reached into the pouch on his hip, rummaging through kunai, explosive tags, the occasional sealed item. He produced a small scroll that had been taken from a missing-nin. It was rumored to detail forbidden techniques involving lightning release. He had studied part of it but found it lacking for his advanced style. 

"Would this do?" he asked guardedly.

Takashi held out his hand, and Sasuke stepped forward, still tense. Their fingers nearly brushed as he handed the scroll over. Takashi felt the subtle aura of the shinobi's presence—dangerous, coiled. Trying to remain cool, he opened the shop's scanning interface, letting a swirl of pale blue light envelop the scroll.

After a moment, the System's disembodied voice spoke: **"Trade Value: 1,200 Shop Credits. Insufficient for the requested item. Please add more assets or choose a cheaper item."**

Sasuke scowled at the pronouncement. "So it's not enough."

Takashi gave him an apologetic shrug. "Afraid not. But we have other items that cost less, or… if you can offer something else. We do allow partial trades. Or if you're open to offering a fraction of your personal techniques… though I understand if that's off-limits."

His words hung in the air. Sasuke clenched his jaw, obviously weighing his options. Takashi knew the Uchiha's pride: he wouldn't stoop to begging, and he definitely wouldn't want to share any intimate secrets. Sasuke's eyes flicked around the store, falling on a black-lacquered box in a corner display. Something about the calligraphic symbols on its side drew him in.

"What's in that box?" he asked.

Takashi followed his gaze to an unassuming container behind a locked glass panel. He walked over, unlocking the case. He lifted the lid to reveal a set of sleek wristbands etched with swirling runes. "These are called 'Restraining Seal Amplifiers.' They're specialized items that can compress and then gradually release a person's chakra or spiritual power, allowing for a more controlled build-up. On the battlefield, it can give you short bursts of enhanced strength or speed, but if misused, it might do more harm than good."

Sasuke reached out, fingertips tracing the faint pattern. "How… does it compare in price to the sword?"

Takashi called up the System's interface. "The pair of wristbands are 1,100 Shop Credits. If your scroll is worth 1,200, you can afford these. You'd even have 100 leftover. The question is whether this is something you want or need."

Sasuke briefly closed his eyes, considering. If used carefully, these wristbands might enhance his lightning-style taijutsu. But the concept of trading away a forbidden technique scroll—one he'd gleaned partial knowledge from—for some foreign tool that might or might not be reliable gave him pause. Yet, it was an intriguing piece of gear… and might be well worth the cost if it gave him a new edge.

He nodded curtly. "Let's do it."

Takashi placed the scroll on the counter. "System, proceed with the trade?" 

A bright, circular glyph shimmered in the air, scanning both the scroll and the wristbands. 

**"Trade Approved. Item exchange confirmed."** 

A pulse of light, and the scroll vanished from the countertop, replaced by the black-lacquered box. Sasuke took it, eyes reflecting the swirling afterglow of energy. He cracked the box open once more, examining the runic wristbands. "They better work," he said, his tone hinting at a veiled threat.

Takashi gave a polite nod. "If there are any issues, you can return them, as long as you haven't broken them. The Shop ensures fairness in all transactions… so you'll find they do exactly what they promise." He kept his voice even, remembering that Sasuke was not one to be trifled with. But inside the Shop, Takashi felt the System's protective aura. Even if Sasuke tried something, he was safe—though he'd rather not push it.

Sasuke stepped away, adjusting the wristbands on his forearms as a test. He could feel them cling to his chakra, a faint tingle rippling through his skin. Impressive craftsmanship, he had to admit.

Before heading back to the door, he hesitated, turning slightly. "You said you have modern technology too, right?"

Takashi's eyebrows rose. "Yes, though how advanced depends on which world we source from. We have drones, advanced weaponry, vehicles, even prosthetic limbs. Basically anything you could dream up… or more than you'd even imagine."

A flicker of interest passed through Sasuke's gaze—perhaps recalling the advanced ninja tools from later arcs in his own world, or the possibility of exploring new forms of technology to augment his strength. After all, the line between jutsu and technology sometimes blurred in the face of scientific breakthroughs. "I'll keep that in mind," he said, stepping away with measured calm. "This place… how do I find it again?"

Takashi shrugged. "The door appears when you seek something deeply enough that the Shop can provide. It's not entirely under my control. But if the system acknowledges your desire—and you have the means to pay—it'll lead you back. Sometimes it's random, sometimes it's a direct call. But you can't just forcibly open it from your side. The Shop decides."

Sasuke scowled. He didn't like leaving things to chance or cosmic whims. But he had no immediate alternative. "Fine. Then I'll see if it calls me again. And if these 'amplifiers' don't work as expected…" His eyes flashed with an ominous light, the hint of Sharingan swirling. "I'll return." 

Takashi exhaled a slow breath, carefully meeting Sasuke's gaze. "They'll work," he said quietly. "And if you do come back, I'll be here."

Sasuke gave a terse nod, then walked back to the dimension door. Its surface shimmered, revealing again the dark forest from which he'd come. With a final glance over his shoulder, he stepped through the portal and vanished.

**Whoosh.** 

The door closed by itself, returning the shop to stillness. Takashi released the breath he'd been holding, his heart racing. Holy—Sasuke Uchiha in the flesh. This place really can bring in anyone. 

He slumped onto a nearby stool, gazing at the closed door with conflicting emotions. Relief that Sasuke hadn't decided to test his invincibility by hurling a Chidori at him. Curiosity about how such a trade might alter the events in Sasuke's world. And a sense of responsibility that weighed heavily on his chest.

**Trade Completed** 

**Profit Earned**: +1,100 Shop Credits 

**Remaining Balance**: 2,600 Shop Credits (including leftover from Rin's trade) 

Another neat sum in his account—though the currency felt oddly intangible. The System insisted that these Credits were crucial for him to access new items or restock certain rarities. In essence, if he wanted to buy from his own stock for personal use (in emergencies or if he needed to venture outside), he'd have to pay with these Credits.

"Well, that's that," he murmured. The day had turned to dusk outside, city lights flicking on across Tokyo. His normal, unknowing neighbors were just finishing dinner or relaxing at home, oblivious that only a few feet away, interdimensional commerce was unfolding.

Takashi reflected on Sasuke's stony expression and tense aura. This was no mere cameo—these were living, breathing people with intense backstories, conflicts, and motivations. The Shop, meanwhile, offered them a chance to gain unimaginable power with just a single transaction. **And if enough of them found him…** The ramifications were staggering. Entire storylines could change, for better or worse, because of the items he sold. 

That notion made him uneasy. "System," he whispered, calling up the silent interface. "I need to know… am I messing with fate by selling these items? Could I cause chaos in their worlds?"

A second later, the disembodied voice replied in its neutral monotone: 

**"The System Shop exists outside the bounds of conventional fate. All transactions are based on the will and desire of the buyer. The Shop does not enforce what they do with the items. The risk and responsibility lie with the purchaser."**

Takashi sighed. "So basically, you're telling me I can't control how they use them. Right…" 

**"Correct."** 

He closed the interface, running his hands through his hair. "I guess that's the price of free enterprise," he joked sarcastically. But the weight of that truth settled in the pit of his stomach. If Sasuke used those wristbands to achieve something catastrophic, would Takashi share some responsibility?

Yet, the logic was clear. **"There's nothing free; everything has a price."** Perhaps that also applied to Takashi's own moral burden. He told himself that it was up to each visitor to decide how they used the Shop's goods. After all, ordinary stores in the real world couldn't prevent a customer from misusing a kitchen knife. This was the same principle, albeit on a cosmic scale.

He rose from the stool, checking the lock on the dimension door. It never truly locked in the conventional sense, but ritualistically, he flicked the latch anyway. The swirl of runes dimmed, settling the store in calm twilight. 

Walking past shelves of incongruous items—bags of modern snacks next to small glass vials containing swirling magical essences—Takashi paused in front of a tall mirror near the back. He gazed at his own reflection: an average young man with dark hair, modest build, though the reincarnation had given him some refined features. Nothing about him screamed "mighty merchant." Yet here he stood, bridging endless realities.

"Invincible in the Shop, maybe," he muttered, "but I'm still me outside these walls." He touched the mirror's cool surface. The reflection stared back, tinted by neon lights from outside.

A thought crossed his mind—**Should I try to prepare for the day I get caught outside by a dangerous visitor?** The System presumably had items or ways to defend himself, but he'd have to purchase them using his newly accumulated Credits. That was the cyclical nature of the system: he sold items to earn Credits, which he could then use to buy items for personal use. 

He called the interface again, browsing the "Personal Use" section. Blades, guns, cloaking devices, magical talismans. Each had a cost. He scrolled down until one particular item caught his eye: a small ring etched with runes. **"Shopkeeper's Gate: Instantly teleport back to the Shop from any location, as long as the Shop dimension is active."** 

Cost: 5,000 Shop Credits.

He considered it carefully. That ring was expensive, more than double his current balance. But if he had it, he could vanish from any threat and return to the Shop's safety in a heartbeat. "One day," he murmured, memorizing the item's name. "One day soon."

At length, Takashi shut down the interface and headed to lock up for the evening—at least for the front entrance that led to normal Tokyo. He turned out the lights, leaving only a single warm glow above the counter. The dimension door at the back looked innocuous now, just a simple wooden frame in the shadowy corner.

His mind churned with half-formed plans. Should he expand the store's layout? Add more shelves for advanced items? Perhaps build a lounge area where customers could sit if they wanted to discuss bigger deals? The idea of hosting different anime figures in a comfortable waiting area was surreal yet strangely alluring.

**Tomorrow**—the thought made him both excited and apprehensive—**someone new might show up.** A cunning villain with world-conquering ambitions, a lost hero searching for hope, or a comedic protagonist just wanting a midnight snack. The Shop didn't discriminate. It was open to all.

When he finally retreated upstairs (his small apartment was directly above the store), Takashi sank onto the bed. Staring at the ceiling fan's slow rotation, he wondered if he'd ever sleep soundly again, knowing that at any moment, someone from a distant universe might drop in. 

A long sigh escaped him. **This** was his second life. Freed from the normal drudgery by a cosmic slip-up, now the caretaker of a gateway across worlds. He told himself that if it ever got too overwhelming, he could lean on the System's protection. He was "invincible" in the shop, after all.

But deep down, a spark of excitement refused to be smothered. Meeting Rin, meeting Sasuke—he was crossing paths with legends. And each encounter promised new surprises, new revelations. 

As he closed his eyes, images played in his mind: Rin's elegant posture, the ring glowing on her finger, Sasuke's intense stare as he tested the new wristbands. "What next?" he whispered, half-lidded in fatigue and anticipation.

Soon sleep overcame him, and in his dreams, the dimension door glowed with a kaleidoscope of possibilities, each leading to a world beyond imagination. Outside, Tokyo's nightlife thrummed away, its neon lights flickering in the sky—a silent witness to the existence of a tiny wooden door that quietly transcended every boundary of existence.

Tomorrow would be another day of bargains, trades, and cosmic connections. **There's nothing free; everything has a price.** Yet as Takashi drifted into slumber, a small smile curved his lips. **He** was more than ready to pay that price, if only to see what lay on the other side.