Invincible in the world, starting with the ghost curse

“Ahhhhhhhh.”

Zenitsu Azuma stared at the brightly lit streets, the night sky lit up by lanterns as bright as day, his mouth wide open. Inosuke, on the other hand, was impulsive and hyperactive.

"Don't run around, and don't get off this carriage." Uzui Tengen grabbed Inosuke and Zenitsu. Outside the city, several people chose to take a carriage into the city. One reason was to hide their specialness from Kamiya Seiichi, and the other was that some people were really tired.

These guys are truly hilarious. It's a shame I won't be able to see them in women's clothing later on, otherwise I'll be laughing for a whole year. No, when did I become so wickedly funny? Is it because I've been practicing for so long and have nothing to vent about?

"Everyone, I'm here now. If you need anything, I'm in the hotel over here. You're welcome to come find me."

Kamiya Seiichi said goodbye to the four and returned to his hotel room. He knew the battle was about to begin, and he had to adjust quickly. This was different from the college competition. In college competitions, opponents wouldn't be killed, but demons would try to torture you to death. He always remained calm in the face of danger. Faced with life and death, he was surprised to find that he wasn't afraid at all. Could he be a battle fanatic?

Meanwhile, the foursome began making arrangements.

"That Kamiya Seiichi is not a simple person."

Uzui Tengen's first sentence made Sanxiao a little confused.

"Mr. Uzui, he shouldn't be a demon slayer. He doesn't have the Nichirin Sword, and he's not a demon." Tanjiro asked in confusion.

"It's precisely because he's not a ghost that we can ignore him for now. The most important thing now is the problem with You Guo. We must investigate thoroughly."

Uzui Tengen changed the subject. He then revealed that he had three wives and started a quarrel with the three girls. Finally, he made them dress up as women and go to the main houses of the geishas.

As the foursome began their intensive action, Seiichi Kamiya explained the basic situation of Demon Slayer in a simple and easy-to-understand way. He reviewed the information gap, saying that it was very important because it determined how much one would gain later.

As the name suggests, Demon Slayer focuses on demon-killing. In the distant past, a nobleman contracted an incurable disease and hired a doctor to prescribe a cure to prolong his life. Unbeknownst to him, the doctor was actually testing the drug on him. As time passed, the nobleman realized his condition hadn't improved, so he furiously killed the doctor. However, shortly after the doctor's death, he unexpectedly discovered his condition had healed, and he'd become incredibly powerful and almighty. The only price he paid was cannibalism, a price he didn't care about. Instead, he became afraid of sunlight.

In later times, he would distribute blood to humans, transforming them into demons to aid him in his quest for the blue spider lily, a flower that could overcome sunlight. As demons proliferated, incidents of cannibalism became more frequent. Insightful individuals observed these demons and, under the guidance of the Ubuyashiki clan, formed the Demon Slayer Corps, specifically to eliminate the man-eating demons. Thus, the demons and the Demon Slayer Corps engaged in a long struggle.

Oni possess the power of immortality and can only be killed by cutting their necks with a Nichirinto (a sword imbued with the power of the sun) or by being shone by the sun.

Breathing techniques are supplementary techniques invented by humans to counter the power of demons, significantly increasing their potential. These techniques were independently developed by the first generation of swordsmen and passed down through generations. Legend has it that the Sun Breathing, created by a powerful warrior named Yoriichi Tsugikuni, is the origin of all of this, earning it the name "the original Breathing Technique."

In the Demon Slayer Corps, the strongest are called the Pillars. There is no fixed number of Pillars, and they are determined by both contribution and strength. Uzui Tengen is the Sound Pillar.

For Seiichi Kamiya, the most precious thing in the Demon Slayer world isn't just his breathing techniques, but his swordsmanship skills. If he wants to reach the pinnacle of kendo, he must learn from many masters and absorb their experience. The Demon Slayer world is a place where everyone cultivates swordsmanship, and communicating with each of these masters is his greatest treasure.

"Kendo exchange, red sword, transparent world, breathing method, these are the things I need to master on this trip." Kamiya Qingyi thought with his eyes closed.

Suddenly, a faint, vibrating sound emanated from outside the window. Kamiya Seiichi concentrated his hearing and could faintly hear a thread of silk thread piercing through the wooden house, wreaking havoc on the townhouses. The ground cracked, and sand and rocks flew everywhere. Without a word, he leaped from the window, sword in hand, and vanished in an instant.

“It’s a bit far, but we should be able to make it in time.”

Tanjiro and Dakimaki were now locked in a standoff, or rather, Dakimaki was toying with Tanjiro. Belts, each one sharp and tough, attacked Tanjiro at high speed. These ribbons were so sharp and tough that ordinary slashes couldn't break them. Tanjiro was wounded, and could only temporarily staunch the bleeding with breathing techniques. The blue stream had vanished, replaced by a fiery red flame.

"Fire God Kagura—Burning Sun." The flames formed a circular vortex, instantly severing Dakimaki's belt. Dakimaki reacted, and more belts shot towards Tanjiro. Tanjiro's face remained calm, and the knife in his hand moved so fast that it rubbed against the air and produced flames. One strike, two strikes... Countless blades blocked all the ribbons. Dakimaki's trembling hands seemed to show her fear and disbelief.

"Impossible, am I afraid? This ugly thing?!"

Blood seeped into Tanjiro's eyes, but he could not feel anything at the moment, because his extreme concentration made him see only the evil demon in front of him who was killing for fun.

Dakimaki hastily distanced herself, leaping onto a nearby rooftop. Tanjiro dodged and landed opposite her. With a calm gaze, he wielded his sword with both hands, slashing horizontally. The ribbons frantically rushed to block, but to no avail. Tanjiro swiftly swung his sword, deflecting all the ribbons, clearing a path to Dakimaki. Without hesitation, he charged forward, reaching her in an instant. He swung his sword, striking her squarely in the neck.

But it didn't sever. Dakime's neck transformed into a silk ribbon, extremely soft and flexible, making it difficult to cut directly. Taking this opportunity, Dakime quickly retreated and attacked again with the silk ribbons, this time with even more than before. However, Tanjiro was even faster than before. In an instant, he tied all the silk ribbons under his feet and cut them all at once, opening a new path to Dakime.

The raging flames carried the scorching blade, and before Daki could react, the knife had reached her neck.

“Eh?”

However, at the last minute, Tanjiro was unable to advance any further, his body having reached its limit. The explosion ended, and Tanjiro lay on the ground, gasping for air and retching.

"Humans are so pitiful." Daki, who had come to her senses, looked at Tanjiro who was kneeling on the ground and retching, and said with pity.

"I don't feel sorry for humans. It's you, on the contrary. What the hell are you?"

Seiichi Kamiya stood on the roof on the other side, looking at the first evil spirit he had seen since coming to this world.