After purchasing the Manna Ore Crystals at the Viz Magic Item Shop, the boy returns home with Yuri!

"Na! Yuri, I'll stay in the alchemy room on the third floor for the rest of this time, don't wait for me for dinner, just leave me some in the kitchen! The boy said to Yuri before entering the alchemy lab.

"Oh! I know! Yuri nodded.

"Also, if Qianhu comes back from the guild, don't forget to tell her about it, ah!"

"Understood!" Yuri made a military salute and said.

"Hmmm! Then the family will be handed over to you and Qianhu! ”

"Hey! Wrap it up with us! ”

After explaining to Yuri, the boy walked into the alchemy laboratory with the materials he had gathered.

This is the first time that the teenager has walked into his own alchemy laboratory, after all, in this family, except for Qianhu who has come in because he has to complete the potion order, neither Yuli nor the teenager have pushed the door in.

"Hey! It turns out that the laboratory at home is like this! The young man said with great interest, looking at the furnishings in the laboratory.

The laboratory is roughly divided into two parts, one is the shelves where the alchemy materials are stored, and the other is the experimental area where the alchemy table is the main one.

Probably because Qianhu will clean up after each use, and the shelves look old, but they are clean and spotless. Not even a trace of dust can be found in the corners and corners where dust is most likely to accumulate.

"Hmmm! It's a lot easier! At least I don't have to clean it myself. The boy muttered to himself after taking a closer look at the entire lab.

After sorting the materials on the shelf, Fubo walked to the edge of the alchemy table and observed the alchemist workbench of this world.

It is a rectangular table made of a single stone slab with grooves of magic circles and runes etched in the center of the slabs that form the table, and the grooves are inlaid with red wire. There was still a blank area on both sides of the magic array, about the size of a palm, and the boy estimated that it was used to input magic power to refine it in batches.

Above the wall next to the alchemy table, the alchemist had set aside a glass cabinet with all kinds of glass test tubes, beakers, and alcohol lamps.

"It seems that this world has been greatly affected by the traversers!" The boy looked at the alchemy laboratory in front of him, which was no different from the chemistry classroom of the previous high school.

After observing the laboratory, the boy raised the black technology bracelet on his hand and called:

"Lu Yue, please bring up the design diagram of the Type 4 Energy Gun."

As the words fell, a light and shadow appeared above the bracelet.

"Understood! Relevant information has been retrieved...... But is that really good? ”

It was the artificial intelligence that Fubo brought from the previous world, and as early as a week ago, this artificial intelligence named Lu Yue had already sorted out all the information fragments in the database. And the weapon drawings that the boy was planning to make now were also discovered from Lu Yue's only remaining materials.

“………… It's okay! This weapon was made just in case! Besides, it's possible that the Demon King Army cadre won't come over, right? This thing is just used as an insurance policy just in case. ”

Faced with the young man's indifferent answer, Lu Yue's face became a little strange.

"But this weapon has major flaws! According to the relevant research and development data, there is a high chance that the energy will collapse after a long period of use. After that, the black hole formed by the collapse will exile the user to an unknown dimension along with the firearm............" Lu Yue said with a serious face.

“……………… I know that. However, in order for Yuri and Chiho to live a carefree life in this town, I have to take this risk. The boy thought for a moment and said.

“………… In that case, then I won't stop you! Let's hope that the materials of this world can bring about a good change! After Lu Yue finished speaking, he projected the drawings on the alchemy table.

"Hmmm! Lend you auspicious words. The young man smiled and nodded to Lu Yue.

Next, the boy uses the materials prepared in advance as materials to create a generator as the core.

The so-called Type 4 Energy Gun is a plasma that transforms water from a liquid to a high-energy state by generating a certain position, and then emitting it from the emitting port.

Because the energy of water becomes extremely unstable after being converted into plasma, the tubular channel used for emission must be made of materials that are resistant to high temperatures, corrosion, and have strong energy conductivity, so that the plasma will not escape on its own.

Only in this way can the finished barrel be able to not only emit energy at sub-light speed, but also to greatly concentrate the energy through the restraint device inside the barrel to increase the range.

"Excellent! Sure enough, the idea of using Mana Ore Crystals as an energy pathway was correct. The boy said after he finished making the ball-shaped generator.

Next, he used Yadaman ore as a raw material to create a pipe with a diameter of about 20 millimeters.

At this point, the two main components of the Type 4 Energy Gun have finally been completed! The next task is meticulous work, and the teenager needs to embed nano-scale energy pathways into the barrel of the gun.

This step is very important, so it must be embedded one by one, although there will be no major mistakes with Lu Yue's assistant boy, but because the workload is too large, it still took a whole night to complete the work.

In the early morning, a layer of mist was still shrouded in the outside of the house, and the sleepy-eyed boy looked at the newly assembled weapon in front of him, and finally fell to the ground and fell into a deep sleep with relief............

There was a flurry of snoring in the air.

Exhausted, the boy had been asleep for five hours before he was woken up by a loud announcement.

"Emergency broadcast! Emergency Broadcast! Attention all adventurers, please immediately get fully armed and assemble at the gate of the town ............ in battle mode after hearing the announcement! ”

"It's weird! How come there have been a lot of these collections lately!? The boy rubbed his sleepy eyes and sat up.

"Why don't you just go?" Lu Yue's phantom floated in front of the young man and said.

"No! After all, I'm a guild-registered adventurer, and I can't skip a broadcast like this without something important! The boy stood up and stretched.

"Could it be that the Demon King Army cadre is here again?" Lu Yue guessed.

“………… It shouldn't be so fast! Unless Megumi still goes to his castle every day to release the burst ............"

"Emergency broadcast! Emergency Broadcast! Attention all adventurers, please immediately be fully armed and assemble at the main entrance of the town in a fighting state when you hear the announcement! ……………… Especially the adventurer Kazuma Sato and his accomplices, please hurry to the scene as soon as possible! ”

The familiar sound of the radio sounded again, and the content that came made the boy feel his face hurt! There's nothing wrong with slapping your face in seconds!

The mood at this moment cannot be expressed.

After saying "it! After that, the young man grabbed the energy gun on the table and rushed towards the main gate of Axel City!

"Ahh Sure enough, that's right, that guy is here again! The teenager who felt his destination slapped himself in the face and said.

Before the boy arrived at the main entrance, there were already a lot of adventurers gathered there! Among them, the most eye-catching is the four of Kazuma who are surrounded like stars and moons, and at this moment, Sato and Zhen, who are the leaders of the adventurer team, look at the culprit who gathered everyone with a black line.

That's right! It's that Demon King Army cadre, a headless horseman named Beldia!

This Demon King Army cadre came over with a group of younger brothers to smash the field again!