That Time I Got Reincarnated as an Underground Labyrinth Manager

The next morning.

Inside the meeting hall.

The magic contract activated, and with that, the Armed Kingdom of Dwargon and the Monster Federation officially formed an alliance.

News like this was sure to spread to the Western Nations in no time.

"It's been a pleasure working with you."

Chishiya shook hands with Gazel Dwargo.

The Dwarf King gave a solemn nod. "To a prosperous alliance, Chishiya."

"Thank you for your hospitality last night."

"It's getting late. We should take our leave."

"Please wait a moment."

Chishiya gestured for them to hold on and gathered everyone's attention.

"Why don't we kick things off with our first trade?"

Gazel blinked.

"Right now?"

Chishiya nodded. "That's right. The sooner we cooperate, the sooner the benefits come rolling in."

He raised his hand casually.

From the void, a black hole shimmered open and dropped a box onto the table.

A neat container full of sleek, compact tools.

"What are these?"

The Dwarf King reached in and pulled out a small, cube-shaped item.

"Communication magic devices," Chishiya said, tapping the cube.

"They replace high-tier transmission spells. Range? Thousands of kilometers."

The dwarves' eyes widened.

They rushed in to examine the devices up close.

"There's a complex magic array etched inside."

"Ordinary craftsmen couldn't reproduce this."

"The artisan behind this must be a master of magical engineering."

Coming from dwarf craftsmen, that was high praise.

If Vanir were here, he'd probably explode from ego inflation.

"But they do require a base station," Chishiya added, pulling out a central relay core.

"A single one of these covers a 50-kilometer radius. That's enough for the entire country of Dwargon."

"Fifty kilometers?!"

Gazel stared at him, stunned.

"You invented this?"

Chishiya shrugged with a modest smile. "Let's just say I studied the wisdom of my predecessors."

"So, Gazel-san, what do you think?"

Gazel slowly nodded and gave a reply:

"It changes everything."

"It's more compact and discreet than a crystal ball. If deployed on a battlefield, it'd be a game-changer."

Ah yes… otherworld logic. First thought: military use.

Whatever.

Chishiya didn't care how it was used, as long as it sold.

"We're planning to put these on the market," Chishiya said. "As our ally, Dwargon gets priority."

"So, what do you say? Need any?"

He lifted the cube again.

Gazel thought for a moment, then asked, "How many units do you have in stock?"

"About 200."

"We'll take all of them."

"…Really?"

Even Chishiya was briefly caught off guard.

Gazel nodded, dead serious.

"This is a strategic-level tool. Something like this has never appeared in any nation."

"Whichever kingdom secures it first will hold the advantage."

"I didn't expect you to come up with this…"

"Clearly, forming ties with you was the right decision."

---

Developing and supplying Dwargon with exclusive magic tools meant massive profits.

Initial contracts stabilized around 300 gold coins per year.

In this world, gold coins had real value.

One gold coin was worth around 10,000 dollars.

So 300 coins translated to 3 million dollars.

Back in the Konosuba world, defeating a Demon Lord army general earned a 300 million Eris bounty.

Converted, that was only about 2.8 million dollars.

Now, with one business line alone, he'd exceeded that—every year.

A stable and reliable revenue stream.

And that was just the start.

Chishiya hadn't even touched the logistics of cross-world goods, or flipping magic crystals and potions.

Those were side hustles.

He wasn't about to bother the Dwarf King with petty trader talk.

Once the trade routes were up, everything else would fall into place.

---

After the dwarves departed, Chishiya returned to his room.

He'd relocated his residence to a quieter area.

Perfect for solo living, with a newly built hot spring pool in the back courtyard.

Stripping down, Chishiya soaked in the bath and let out a relaxed sigh.

Time to handle the Labyrinth transfer.

He opened his system panel.

[Labyrinth Level: 2]

[Upgrade Cost: 1,000,000 Reputation Points]

[Current Reputation: 300,000]

[Teleportation Anchor: 100,000 Reputation Points]

The second anchor cost more than the last one.

But manageable.

Chishiya closed the window.

Once the town was fully stabilized, he'd integrate the Labyrinth completely.

For now, all he wanted was peace and silence.

He leaned back and closed his eyes in the hot spring.

---

Rustle…

"Sensei's so sneaky! He built this entire deluxe estate just for himself!"

Megumin whispered, wrapped in a bath towel like she was infiltrating a dungeon.

"M-Megumin… this doesn't feel right," Darkness followed nervously, also wrapped in a towel.

She looked around cautiously, clearly uneasy.

"Relax, airhead~," Megumin waved her off.

"Sensei's probably still in some boring meeting with Gazel."

"So as his beloved disciple, I'll test the waters for him! Wahahaha!!!"

She boldly slid the door open.

And came face to face with Chishiya.

In the bath.

Staring at her with deadpan confusion.

"…Eh."

Her brain stalled.

Her gaze drifted downward…

AHHHHHHHHHHHHHHHHHHHHHHH!!!

Darkness rushed over. "Megumin! What's wrong?!"

SLAM

Megumin slammed the door shut with a thunderous bang.

Her face turned a nuclear shade of red.

"Let's… let's go. The place isn't ready yet."

She flailed her arms and looked like she had seen the gates of heaven… and hell.

Darkness blinked. "Not ready…?"

She tried to peek, but Megumin yanked her back.

"Let's go! Sensei's probably almost done bathing!"

"It'd be really bad if he saw us!"

Before Darkness could argue, Megumin dragged her into a full retreat.

I saw everything…

Sensei's really…

She swallowed.

Her face went even redder.

---

In the hot spring…

Chishiya rubbed his temples.

"That girl screamed like she'd been murdered."

"I need to put up a sign or something."

"Living under one roof with these lunatics is a privacy disaster."

---

One month later

Things had calmed considerably.

The road connecting the town to the Armed Kingdom was nearly complete.

So was the road to the lizardmen's home.

The High Orcs were excellent at civil engineering.

The town's infrastructure was growing more complete by the day.

Drainage systems, indoor plumbing—every household now had clean running water.

After Gazel left, he even sent over a thousand dwarf craftsmen.

Chishiya now had a steady technical workforce.

No more outsourcing.

Back in his system panel…

[Teleportation Anchor: 100,000 Reputation Points]

[Confirm Purchase?]

"Confirm."

[Remaining Reputation Points: 200,000]

[Initiating Fusion...]

The ground began to rumble.

Benimaru and the others looked toward the horizon.

Kaijin emerged from the workshop.

All across town, people paused, walking into the streets to witness it.

In their stunned gazes—

A vibrant, stylish town emerged on the eastern side.

The two towns fused into a single, grander city.

Before anyone could make sense of what happened.

Aqua walked out from the new section.

Holding a bag stuffed with snacks.

A bottle of premium wine in each arm.

Cream all over her mouth. Cheeks full.

"Eh?... What just happened?"

(To be continued.)

***

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