Nobita, quickly use your invincible treasure bag to think of a solution!

In addition, when talking about the demonization potion, we have to mention Shinobu Kocho. Ever since Nobita gave her a bottle of demonization potion, Shinobu Kocho has been conducting research in her basement and has not left the house for a full half month. If the meals that Aoi Kanzaki sent to her every day were not eaten up in the end, proving that she was still alive, Nobita would have to consider saving her.

……

Half a month passed in a flash, and the Nichirin Sword that Tanjiro and Inosuke had been waiting for for a long time was finally delivered. Both of them were looking forward to their new weapons.

In addition to anticipation, Tanjiro also felt a little guilty. He had just promised Mr. Koutsuka that he would use and maintain the Nichirin Sword well, but the sword broke the next night.

Ding-ding-ding-ding-ding!

The glass wind chimes hanging on the bamboo hat swayed gently, and two men wearing fire-blowing masks walked to the door of the Butterfly House. One of them was Koutsuka Tetsutetsuka, and his clothes were the same as last time. The other one had two sword boxes on his back, which contained Tanjiro and Inosuke's weapons.

Deng Deng Deng!

After Koutsuka entered the yard of the Butterfly House, he immediately saw Tanjiro sitting on a small bench not far away with sweat on his face.

Koutsuka reached behind his back, pulled out two kitchen knives, and rushed towards Tanjiro. The anger in his words was clearly audible: "Kill you, kill you, I will definitely kill you this time~~~"

Resentment, anger, excitement, impatience and a little bit of guilt.

After sensing the smell emanating from Katsuzuka, Tanjiro ran away, apologizing to Katsuzuka as he ran.

Unfortunately, Koutsuka was so angry that he didn't listen to Tanjiro's explanation at all. He wielded two kitchen knives vigorously, making Tanjiro jump up and down.

Katsuzuka should indeed be angry. He had just handed the Nichirin Sword to Tanjiro the day before, and the sword was cut off the next night. Katsuzuka's people were still on their way back, and as soon as they reached the village gate, they received a message from Tanjiro's crow, saying that Tanjiro's Nichirin Sword was broken again.

That was the Nichirin sword that was forged using ancient methods by Katsuzuka after he carefully studied the Nichirin sword of his predecessor. The materials used were different, but it broke into two pieces as soon as it was given to Tanjiro to use.

Koutsuka felt that his skills were insulted, and he also felt a little guilty.

The most precious thing to a swordsman is his weapon. Thinking that the sword he made almost killed a swordsman, the guilty Katsuzuka could only turn his mood into anger and then chase Tanjiro.

After chasing Tanjiro for an hour, Koutsuka finally calmed down a little. While eating Mitarashi dango, he poked Tanjiro's face and warned Tanjiro that if he broke his sword again, he would kill him.

Tanjiro touched his new sword and thought about it. Suddenly, his hospital gown bulged out and four arms came out from behind him, almost choking Tetsuzuka who was eating a meatball next to him.

Tanjiro touched his head and smiled at Koutsuka a little embarrassedly: "Well, Mr. Koutsuka, can you help me make four more swords? I forgot to tell you before, I am actually a five-sword style swordsman..."

Shinobu Kocho and the others didn't mention the fact that Tanjiro has a ghost hand behind him, and Tanjiro didn't mention it either, so the other pillars don't know that Tanjiro has a ghost hand yet.

Koutsuka looked at the four broken Nichirin swords in front of him, then looked at Tanjiro who was sitting there with a silly smile. He was not afraid of Tanjiro's four hands. He just flew up and clamped Tanjiro with a deadly scissors kick.

"You damn big forehead, why didn't you say it earlier? Why didn't you say it earlier? Do you know how much trouble it will cause if I run away? I will kill you, I will definitely kill you!" Ketsutsuka pouts Tanjiro's arm, and Tanjiro screams and begs for mercy.

"Wait, Mr. Tetsuzuka, I was wrong. Next time I will tell you in advance, I will tell you in advance..." Tanjiro begged for mercy in pain.

"Damn it, you broke the knife twice, but how many times do you want to break it? Die, you bastard!"

"It's broken, Mr. Tetsuzuka, your arm is about to break~~~"

……

Compared to Tanjiro and Katsuzuka who are in love and hate with each other, the relationship between Tetsunamori and Inosuke is much more harmonious.

Tesanamori introduced himself to Nobita who happened to be passing by and came in to watch the show: "My name is Tesanamori, and I am responsible for forging Lord Inosuke's sword. I feel honored to play a role in the battle."

Inosuke held his Nichirin sword in his hand and observed his new sword.

Under the guidance of Inosuke's breathing method, the silver-white Nichirin Sword began to change color in Inosuke's hand. There were two colors. The Nichirin Sword on the left turned into a blue-gray color with mist, and the Nichirin Sword on the right turned into a deep red color like a flame.

Inosuke used to pick up other people's Nichirin Swords, so their colors were normal silver-white. But now that he has his own Nichirin Swords, Inosuke's two swords have become his colors, and they are both single colors, unlike Tanjiro's black and red and Zenitsu's gold and blue, which are double-sided colors.

Katsuzuka, who was holding Tanjiro's arm, saw a crimson knife appear in Inosuke's hand and became even more angry. He turned around and sat on Tanjiro's back, twisting Tanjiro's legs and yelling, "Look at that pig-headed boy, his color is crimson like fire, what about you? Make this two-color knife only crimson, you bastard!"

"Please spare my life, Mr. Tetsuzuka..." Tanjiro patted the tatami and begged for mercy to Tetsuzuka behind him.

Inosuke didn't think much about the farce happening behind him. He looked at his Nichirin sword, stood up, jumped to the pond in the yard, picked up a hard stone, and prepared to smash the sword.

Tesanamori on the side didn't understand Inosuke's behavior, but Nobita did, so he came to Inosuke's side, took back Inosuke's knife, and interrupted his idea of smashing the knife.

"Hey? Why did you take my knife?" Inosuke was a little unhappy. Just when he was about to modify his knife into a serrated shape that he liked, Nobita took his knife away.

"Mr. Tetsunamori, do you mind if I make a small modification to the Nichirin sword you made? Inosuke needs a Nichirin sword that is more suitable for him."

Nobita ignored Inosuke and turned to look at Tesanamori beside him and asked him.

Tiejianemori said in a very humble manner: "This... Mr. Nobita? Are you also proficient in forging? If you want to modify it, it's no problem... What are you doing!"

Ding!

Nobita wielded the two Nichirin swords in his hands, and collided their blades against each other. After a sharp metal collision sound, the two Nichirin swords each broke into two sections.

"If you have any problem, you can come to me. Why are you insulting my craft? Ah, I'm going to kill you, kill you!"

Teixemori was searching the ground for the kitchen knife that Tetsuzuka brought, wanting to chop Nobita into pieces alive.

To destroy someone's carefully crafted Sun Blade is to trample on his hard work!

Seeing this, Tietie Zong hurried over to stop Tiexuesen and said, "Wait a minute, wait a minute, Tiexuesen, don't be angry, let's take a look first, let's take a look first."

Koutsuka understands that Nobita is a man of hidden talents. He was able to take out three peerless swords used by his predecessors, so he must have some knowledge of forging, otherwise anyone would regard those three rusty swords as garbage.

Nobita glanced at Tiexuesen, then stacked the four broken blades together, placed them on his knees, and broke them apart with force.

The magic power was transmitted to the blade through Nobita's fingers, and the blade broke into eight sections.

"Ahhh, Iron Mound, don't stop me. I want to kill him. I must kill him."

Tiexuesen was completely furious. This kid clearly looked down on his craft and humiliated him in front of him. This was intolerable.

After breaking the two Nichirin swords into pieces, Nobita waved towards Inosuke and said, "Come here, Inosuke, I have a gift for you."

"What gift? A new Nichirin sword for me?"

Inosuke also doesn't understand Nobita's behavior, but he believes that Nobita will not cheat him.

Nobita nodded: "Well, you are half right. Stretch out your hands. Two hands."

Inosuke raised his hand and extended his palm towards Nobita.

Nobita looked at the two hands stretched out, and cut a wound on Inosuke's palm with his fingers, and blood gushed out from Inosuke's palm.

Then Nobita took out the Blood God Gourd from his arms, and the big mouth under the Blood God Gourd opened, spitting out two blood-red jellies the size of Rubik's Cubes, which fell into Inosuke's palm.

After the two lumps of jelly touched a pig's blood, they instantly spread out and deformed, covering Inosuke's hands. Then Nobita placed the broken Nichirin sword blade in his hand on Inosuke's hands, with a blue-gray blade in his left hand and a crimson blade in his right hand.

creak creak!

Two balls of jelly wrapped around the blade fragments, making a chewing sound. The blade fragments kept shrinking and finally disappeared in the jelly. The color of the two balls of jelly also turned into the same color as the Sun Blade.

The two lumps of jelly that absorbed the fragments of the Sun Blade turned into snakes and drilled directly into the wound on Inosuke's palm. When the last 'snake tail' drilled into Inosuke's wound, Inosuke's wound healed automatically, and in the blink of an eye, the wound disappeared.

"Ohhhh...so cool, so cool, what is this? What is this?"

Inosuke suddenly shouted in surprise, and his body shook after the two jelly snakes completely entered his palms.

Swish!

Countless blades emerged from his back, chest, and arms, half with blue-gray blades and half with crimson blades.

"Nobita, what's going on?" Tanjiro pointed at Inosuke and asked Nobita. "Inosuke is not suitable for using a knife, he is more suitable for close combat. This is a gift I prepared for him. It is similar to your demon hand. Now Inosuke also has some demon power hidden in his body." Nobita pointed at Inosuke and explained, "Come on, Inosuke, show the power you have gained."

"coming!"

Inosuke controlled the fragments of the Nichirin Sword to retract into his body, and his clothes instantly turned into beggar's clothes. Then a sharp blade grew out from Inosuke's elbow, and there was a metallic support rod on the back of the blade to support it.

"Wow, it can spin. Great, great, great, great. I like this gift!"

Inosuke waved the blade on his arm, and the blade emitted a dazzling light and there were bursts of breaking sounds. Inosuke laughed excitedly as if he had got a new toy.

Tanjiro and others on the side discovered that the blade on Inosuke's arm was closely arranged with many small hook blades as sharp as shark teeth. These small hook blades were moving rapidly on the edge of the blade on his arm, and the complex light reflected by these hook blades during high-speed movement looked like the blade itself was glowing to bystanders.

Whoosh!

Inosuke slashed his right arm horizontally, and the dazzling sword energy visible to the naked eye swept out and hit the clothesline next to him, cutting the bamboo clothesline neatly.

"Hahaha, interesting, really interesting!"

Inosuke was not satisfied with the power of the blade on one arm, so he also grew a blade on his left hand, which also emitted dazzling light.

Inosuke took two steps at a time and rushed to the remaining clothesline. He swept his hands horizontally, and the sharp blade easily cut the clothesline into three sections like a hot knife cutting butter. On the fallen clothesline, the clothes washed by Kanzaki Aoi were covered with mud and were stepped on by Inosuke, who was so excited that he screamed.

Kanzaki Aoi, who came rushing over after hearing the noise, saw that her washed clothes were treated like this by Inosuke, and she scolded Inosuke loudly. Inosuke became playful and started playing a chasing game with Kanzaki Aoi, fighting and playing, and was very happy.

On the other side, Tanjiro and the other two were dumbfounded. They didn't expect that Inosuke would actually have such ability.

Tesanamori suddenly knelt down in front of Nobita: "Mr. Nobita, please teach me how to integrate the power of the demon into the forging process and create a unique demon blade!"

Tetsukae Sen wanted to improve so badly that the swordsmith village also had its own ranking list, where those on the list competed to see who forged the most sophisticated Nichirin sword, what kind of monsters the wielder of the Nichirin sword had killed, and whether they were lower-rank or upper-rank monsters.

Craftsmen don’t have any pursuits, they just want fame and fortune.

Everyone in the swordsmith village is proud of the Nichirin swords they forge. Forging just a katana is nothing. Being able to forge a Nichirin sword with special skills is the honor of a craftsman.

Tiejianemori felt that his qualifications were limited and he didn't have the brains to forge a special type of Nichirin sword. Forging swords for ordinary team members was already his limit. However, after seeing Nobita's forging skills today, Tiejianemori opened a new door.

Why can't we use demons as materials to create a more powerful Nichirin Sword?

Tiexuesen's heart was becoming hot and his blood was boiling, and he felt the possibility of going further.

"Master, please teach me how to turn evil spirits into materials and integrate them into forging a sword!"

The genuine Dogeza has already shown Tiexuesen's determination.

Seeing this, the nearby Iron Mound rushed over, not wanting to be left behind, and said, "Master Daxiong, I also want to learn this sword-forging technique. Please teach me!"

As a clan that has been fighting against evil spirits for generations, everyone in the Sword Forging Village knows how difficult evil spirits are to deal with. They have strong self-healing abilities and special powers. Killing people is as easy as drinking water. They are extremely terrifying existences.

Moreover, it is easy to make a knife that can kill small fish demons, but it is difficult to make a knife that can kill lower-rank or even upper-rank demons, and that can adapt to the user's breathing method.

After Shan Si witnessed how the Nichirin Sword grew out of Inosuke's body today, Tesanamori and Koutsuka discovered the door to a new world. If ghosts can also be used as materials, will the Nichirin Sword become stronger?

If humans could also use the blood demon arts of evil spirits through the Nichirin Sword, would it be easier to kill evil spirits?

Swordsmiths in the past were limited by materials and vision and could only forge traditional Nichirin swords. However, after seeing the new technology, Tetsukanamori and Kōtetsuka discovered new possibilities in forging.

"Please Master Daxiong, teach me how to turn ghosts into materials to forge a new Nichirin Sword!" X2

Koutsuka and Tetsunaemori both knelt down in front of Nobita, their tone very sincere.

Tanjiro was shocked. Using ghosts as materials? What kind of crazy brain circuit is this?

"This... let me think about it." Nobita hesitated for a while and did not agree.

Nobita never expected that he just thought of the attack style of a certain ultimate creature and used Inosuke as an experiment, but he actually made the people in the swordsmith village realize the possibility of forging the Nichirin Sword, and this possibility is very likely to come true.

The human spirit of exploration is terrifying!

Chapter 378 Changing Eyes

Before teaching Ketsutsuka and Tetsuganamori the sword-forging techniques, Nobita also found the two swordsmiths to study the forging techniques of special models of Nichirin swords, such as Kanroji Mitsuri's whip blade and Kocho Shinobu's poison blade.

The reason for doing this is that Nobita intends to upgrade Tanjiro's Nichirin Sword into He Sword mode.

In the entire Demon Slayer world, there are only a few cheats that humans can use, namely the Mark, the Transparent World and the Red Blade. The fact that Tanjiro has all of them shows that he is worthy of being the protagonist. Nobita also has no plan to let Tanjiro open the Mark. The only person in this world who can open the Mark and still die of natural causes is Yoshiichi Tsugakuni. The rest of those who have opened the Mark, on average, died of physical failure in their twenties.

But as the difficulty of killing demons increases, Nobita has to consider equipping Tanjiro with a few more cheats in advance, such as the red sword.

Other people's red swords require a strong grip or the blades colliding with each other to open, but Tanjiro does not need the first two methods. He only needs Nezuko's blood to open the red sword, so there is room for maneuver here.

Under Nobita's command, Katsuzuka and Tetsunamori were responsible for making a secret compartment in the scabbard to store Nezuko's blood, and one was responsible for making a blood collection device on the handle to replenish Nezuko's demon blood.

The purpose of doing this is to ensure that when Tanjiro and Nezuko lose contact, they can still use the red sword to slay demons.

In the Infinite Castle, if Tanjiro and his companions had Nezuko's blood to bless them, the fight wouldn't have been so hard.

After handing the two swordsmiths some weird materials, such as leg bones, arm bones, flesh and blood, and helping them put them into the sword box, Nobita also left a difficult problem for the two swordsmiths, which was how to allow ordinary swordsmen to use the red sword.

Without the two swordsmiths making trouble, the entire Butterfly House returned to its peaceful life at the beginning, and Tanjiro and his friends lived a boring life of fighting against Tokito Muichiro every day.

However, after training for half a month, Nobita reduced the sparring time of Tanjiro and others, and asked them to conduct the most basic training, such as stretching the body, competing with Kanao Kurikara in hand speed, and playing hide-and-seek.

When he found out about this welfare activity where he could get close to beautiful girls, Zenitsu shouted, "Nobita, I love you so much." However, when he found out that he was required to maintain concentrated breathing all day long, even when sleeping, the little yellow-haired boy secretly told Tanjiro and the others that Nobita was inhuman and a bastard who liked to torture people.

……

On this day, Nobita and Giyu Tomioka who passed by were drinking tea and eating snacks in the guest room of the Butterfly House. According to Giyu, he was tired from performing the mission, so he came to the Butterfly House to rest for a while. Nobita did not expose the fact that Giyu was secretly watching Tanjiro's training.

Nobita knew that Giyu Tomioka wanted to quit and stop being the Water Pillar, and wanted Tanjiro to inherit his title of Water Pillar, so he often came over to peek at Tanjiro's training. He used to watch secretly, but now he doesn't pretend anymore and comes to watch openly.

"Nobita, Mr. Beimingyu is here to visit you. Mr. Beimingyu, please come this way."

Kanzaki Aoi shouted to Nobita who was sitting in the room, and then asked the strong man Yanzhu who was standing beside her to guide the direction.

Nobita turned back to wipe the cream off his mouth, glanced at the Beimingyu Xingming whose huge body was about to hit the beam, and said in a very lazy voice: "What's wrong, you fake compassionate blind man, did you kill your enemy?"

Tomioka Giyuu turned around and looked at the rock pillar in front of him, then nodded respectfully and said, "Hello, Mr. Beimingyu."