Where Does Guru Tanjiro Appear In Demon Slayer?

Before going to college, an ordinary high school student went to celebrate and got drunk. When he woke up, he found himself in a completely different world. There was a big sect, the approaching sect entrance examination, a slum where his body’s previous owner lived, and a shared memory about a missing young girl.When he got tangled in a fight with a few punks in this different world, he fell off a cliff and miraculously found himself still alive, with two more voices ringing inside his head. They were Sword Master and Saber Master. In the company of them, he continued to find out more about this whole new world. He took the sect entrance examination, entered the sect, met a strange man in black, and even participated in a major competition of the sect to have a chance to win over his peers!In this whole new world, he was born again and got to explore the fantastic martial world!

It was in the Era of Harmony, trillions of years ago, when Chaos first arrived. To stop all existence from growing rampantly and exhausting all sustenance, the Creator of the universe took on Chaos as its body, the void as its vigor, and black holes as its jaw—a combination to create a world-ending coffin, devouring the seas and setting lands aflame, reducing all to ashes! Later, millions of years ago, the gods waged wars against each other when the same coffin appeared out of nowhere, massacring their ranks and decimating the divine realm. Since then, it had gone missing, but its name continued to echo throughout the universe, leaving both gods and demons in fear! Millions of years later, a youth was buried alive and fused with the coffin where he was kept, and he became an undertaker whose name was heard throughout all worlds. "I'm really bad at saving lives, but I'm quite good with ending them," he said quietly with a cool visage. "I possess the Coffin of the Gods, and I can send anything and anyone to their deaths: humans, worlds… or even the gods themselves!"

Set after the war between the Dragon Emperor and the Blood Emperor, in which the two emperors united to protect all realms and the underworld. In a small world where no immortal beings dwell, a married couple lives with their only son. That life of happiness came to an end with the destruction of their village and the deaths of its inhabitants. The child, having lost his parents, tries to find traces of them, who disappeared when the village was destroyed. The further he walks down the path of cultivation, the more he realizes that he has actually been trapped in a difficult fate. Will he be able to walk that path? Or will he end up losing his own life? This is the story of a young man named Tian Sen, who walks a bloody path to discover who he is and where his parents are. But he must become stronger to reach a point where even fate itself cannot control him. “Why? Why don’t they care about people like us? Why? I, Tian Sen, will not accept any of this. I will walk toward the summit even if my hands are drenched in blood. Loneliness will not let me be swayed by the nonsense called fate!”

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300 years ago, humankind created their own nightmare. Demons, are originally humans but the lust for power changed them inadequately, this is humans own doing. Around 300 years ago, a large asteroid bombarded the earth's very ground. This is the beginning of the birth of demons. This meteor was large, but out of the blue, a mysterious lifeform is intact in it's very core. A human named Cruzius Akiyoma was intrigued when witnessing these menacing looking creature. He interpret this as a blessing from heaven. He then owned the creature and conducted an experiment. He was surprised when he saw the structure and building blocks of life of this creature. He obsessedly pictured this as a one stepping stone through human evolution. He extracted the DNA of the creature and modified it in able to merged it to human DNA. Without any hesitation he then merged his DNA to the DNA of the creature. He is willing to offer his body to attain his goal, thus sacrificing his body is necessary. After the merging, he was surprised because nothing in particular happened. But, he suddenly felt a surging power circulating through his body. He screamed in pain as his body is gradually changing. Darkness fell upon humans as the scream of the first demon engulfed the sky, seas, forest, and fortress.

"Master, do you miss this apprentice?" Lips painted in bright red ticked up in a sharp smile. Her eyes were a pool of dark red, like a swirl of the finest wine. One jaded hand in his throat, nails slightly digging in the skin there, the other was on his cheek carefully caressing. The clashing of both gestures were confusing, but Rion's mind only provided one instinctual response; to run away as far as possible. ----- Rion Ren, one of the strongest sword masters in the world, had to make a difficult decision to hand over his apprentice, Ruby, to the Demon Master when Ruby's real identity as a descendant of Demon Sovereign was revealed. Three years later, Ruby who had successfully taken the reign of the Demon Realm, came back to take revenge on her master that had betrayed and abandoned her in the hand of cruel demons. Rion swore on his life as a sword master, he only wanted to protect those who were precious to him, but how did it manage to turn the whole world into chaos? How would Rion face his own apprentice in a battle between life and death?!