Engineering Complete, Manufacturing Perfume

Heaven Rewards Diligence is incredibly effective.

Not only has Ruri's Transformation Technique greatly improved, allowing her to transform into someone indistinguishable from Kamiya Keiyun, but Kamiya Ishiku's continuous use of the Pipe Technique has also led to considerable progress.

Now, he can create a pipe 45 centimeters in diameter, with a 5-centimeter wall thickness and a length of 15 meters in a single casting!

Originally, Kamiya Keiyun had thought that even if it was narrow, he could just crawl out.

Now that there's so much more room, he certainly doesn't need to put himself through that.

Upon reaching a depth of 100 meters underground, Kamiya Ishiku stopped excavating the pipe and instead began constructing a tunnel 1 meter wide and 2 meters high.

The sides of the tunnel were built with stone bricks, and the top was constructed in an arch shape to better resist the pressure from the soil above and prevent collapse.

To ensure safety, Kamiya Keiyun also created a 4x4 meter chamber every 15 meters. Each chamber not only had a thick pillar in the center but also had corners and walls entirely constructed from the highest-strength rock bricks, essentially creating a safe room every 15 meters.

This way, if a collapse occurred in one section, he could retreat to a safe room either forward or backward and continue excavating after the collapse ended.

While this type of construction might seem unfamiliar, Kamiya Keiyun had actually done a lot of it. His favorite game in college was MC, and now he was simply treating reality as MC and modifying it.

MC had underground tunnels, lava, and water. The underground of Konohagakure, however, had no lava, only groundwater.

But Kamiya Keiyun's ninjutsu excavated from the center outwards, so unless he directly dug into an underground river, the groundwater would be pushed aside and wouldn't enter the tunnel.

In the Ninja Academy, Ruri observed the entire school and her classmates through her somewhat translucent clothes.

Just as Kamiya Keiyun had said, his daily routine at school was extremely monotonous: he'd arrive, put his head on his desk, and stay there until school ended.

No complicated relationships, no complex social interactions, making it easy to play the part.

"There are only two things you need to pay attention to!" Kamiya Keiyun was still imparting his wisdom after school. "First, there's Kakashi. He'll greet me in the morning or afternoon, so just respond the way I did this morning. The other is Inuzuka Hana. This girl seems to like me, but she knows her limits and won't bother me unnecessarily."

"What about that dog? The one named Gumaru. I feel like he's noticed me!" Ruri asked.

"It's not a big deal. He might smell that I smell different than before, but I'll be with you for two days, and he'll get used to it. Besides, he can't talk!" Kamiya Keiyun said.

"Mhm!" Ruri nodded. It made sense. Even if Gumaru noticed something was off, he'd just bark a couple of times.

Who would care about the barks of a little puppy!

Tuesday, after four days of drying in the room, the flowers were finally dry, and the underground project entrusted to Kamiya Ishiku was finally complete!

Kamiya Keiyun had already prepared all the necessary equipment during those four days.

Flasks, glass tubes, an alcohol lamp, distilled alcohol with 95% purity, saltpeter, and so on.

Water was added to a flask and heated on an alcohol lamp.

A glass tube was connected to the top of the flask, and the other end of the glass tube led to a chamber filled with dried and crushed flower petals.

The other end of the chamber was a cooling tube wrapped in ice, leading to a collection bottle for the liquid.

This equipment wasn't the best, but it was far better than the conditions Kamiya Keiyun had when manually making perfume in his previous life. Back then, he couldn't afford beakers and flasks, so he used mineral water bottles from restaurants.

The steam, heated to boiling, traveled through the glass tube to the chamber, then passed through the dried flower petals. The essential oils in the petals were carried away by the steam.

When the steam entered the cooling tube surrounded by ice, its temperature dropped sharply, condensing into liquid and dripping into the collection bottle.

The collected essential oils needed to be left to settle, separating the water from the oils. Then, they were mixed in a ratio of 85% alcohol, 5% water, and 5% essential oils to create perfume.

The cost of this product was extremely low; if produced in large quantities, the cost per pound should be less than 200 taels. However, if sold externally, one pound could be divided into 100 bottles, each selling for 500 taels.

However, the perfume at this stage couldn't be used directly. It needed to sit for 1-2 months to mature. After maturation, the perfume's scent would become milder and richer, without the harsh smell of alcohol.

This was also why Kamiya Keiyun, who took a week to make the perfume, told the Yamanaka Clan he'd need a month before returning.

The prepared perfume was bottled in glass bottles. Originally, there was no place to store them, but now, with the space excavated underground by Kamiya Ishiku, it was perfect.

Kamiya Keiyun personally created a storage room underground. Nearly 400 flowers were made into 260 bottles of perfume, all stored here, safe and at an ideal temperature.

"The environment here seems quite good!" Since he was already here, Kamiya Keiyun took the opportunity to inspect Kamiya Ishiku's project.

In reality, Kamiya Ishiku's memories were transmitted to Kamiya Keiyun every day when he dispersed. He was fully aware of the daily progress of the project, but it was in fragments, and he had never seen the entire underground tunnel project in one go.

Kamiya Ishiku inherited Kamiya Keiyun's obsessive-compulsive disorder. The entire tunnel was built perfectly straight, without any curves, and all the walls were incredibly smooth.

Kamiya Keiyun didn't know the professional term for measuring smoothness, which was surface roughness.

But in his opinion, the stone walls constructed by this jutsu were comparable to marble floors and walls polished by professional equipment!

Even more remarkable was that this jutsu produced no noise, consumed no energy, and generated no pollution.

"If I could go back to modern times, I'd be the most popular contractor!" Kamiya Keiyun exclaimed and walked forward.

The safety rooms originally had a single pillar set by Kamiya Ishiku. Later, he realized that if the pillar was in the center, he couldn't see the end of the tunnel at a glance!

So, he changed one pillar to four, placing them at the edges of the tunnel.

Next to the pillars were two long tables, which were even carved with dragon and phoenix patterns.

Even the walls of the safety rooms weren't bare; they were adorned with paintings. However, these weren't famous world-class paintings but rather somewhat risqué ones.

For example, "Two Immortals Crossing the Bridge," "Split My Melon," and "Sa Ri Lang."

If a stranger entered and saw these murals, they would be utterly confused.

"Where is the light coming from here?" Kamiya Keiyun curiously looked up and saw coin-sized passages carved into the ceiling like stars, and the light emanated from these passages.

Judging by the size of these passages, Kamiya Keiyun understood. This must have been dug by Hei Bei.

The principle is simple: light should refract within the stone walls and eventually reach the bottom.

This is a hundred meters underground, yet it's still bright here. There must be some special setup on the surface.

Following the passage all the way, we passed through a total of 26 safe houses and finally reached the end.

Here, there's only one path leading upwards, but it's not a straight climb. Instead, it's an incline.

It's not a pipe either, but a staircase about a meter wide and three meters high.

Kamiya Keiyun walked for nearly two minutes before finally reaching the end.

The exit here is blocked by a huge stone. It looks large, but it's actually hollow. Kamiya Keiyun gave it a gentle push, and it moved aside!

Opening the large door, Kamiya Keiyun looked at the lush greenery before him, and his mood instantly brightened!

This is a small hillside, hidden within dense jungle. Judging by the growth of the surrounding vegetation, few people come here; it's quite secluded.

Kamiya Keiyun chose a relatively tall tree, stepped onto it, and climbed to the top. Then, he channeled his chakra to enhance his grip on the tree, adjusted his balance, and stood steadily on a treetop.

Using the leaves as cover, Kamiya Keiyun looked around.

First, the Konohagakure wall is within sight. After all, the distance is only a little over two hundred meters. Kamiya Keiyun has good eyesight and can faintly see the ninja patrolling on the wall.

There's also that semi-transparent barrier, which occasionally flickers with a faint, hazy glow.

Konohagakure has a barrier, not only above ground but also underground. However, it's clear that this barrier doesn't extend a hundred meters underground.

Is it because no one in the Naruto World can go that deep, or is there no need for such defense?

Regardless, I'm out!

The book was released on the 12th, and it's been 16 days. I've updated 45 chapters, averaging 3 updates per day.

I have another 21 chapters saved in draft.

I've been super diligent lately. It seems like it's because it's cold, and I have no motivation to go out. I don't even want to play games, so I can't stop writing.

Yesterday, I actually wrote 8 chapters, 18,000 characters.

I should have plenty of plot points for when the book goes premium.

The tentacle monster is evolving daily. More monthly passes and recommendations are needed to support it. Thank you, everyone.