The universe begins with Demon Slayer: Kimetsu no Yaiba

"There is one more thing. It may be a clue to turning your sister into a human."

"More than a thousand years ago, the first ghost was born. As the ancestor of ghosts, its blood has the magic power to turn people into ghosts. So your sister's transformation into a ghost may have something to do with it. Your family was probably killed by it.”

"Maybe, that guy knows how to turn {ghost} back into a human."

After hearing what Rintaki Sakonji said, Bai Yu knew that the {ghost} he was talking about was actually the King of Ghosts - Muzan Onimu Tsuji.

When Nintaki Saru mentioned this recently, Tanjiro couldn't help but interjected: "It has been more than a thousand years, and it hasn't died yet? Then where is it?"

"As the ancestor of {ghost}, how could its whereabouts be exposed so easily!" Nintaki Sakonji raised his voice, seemingly dissatisfied with Tanjiro's ignorant question.

"In fact, the birth of the Demon Slayer Corps is also related to it. The ultimate goal of the Demon Slayer Corps is to completely obliterate it. So for more than a thousand years, ghost hunters have been looking for traces of it."

"That time, Yiyu was following its trail, and then he bumped into you, Nezuko, and Shiroha."

"Remember, the name of this {ghost} is Oniitsuji Muzan!"

After listening to Rintaki Sakonji's final explanation, Bai Yu and Tanjiro truly embarked on a new journey, heading towards the town in the northwest where the mission was mentioned.

Bai Yu knew that after this separation, it would be difficult for the two of them to see Rintagaki Sakonji again.

After a day and night of trekking, Bai Yu and Tanjiro finally saw a town in the distance from the mountainside.

Tanjiro stood on the edge of a mountainside, pointed at the town located on the plains at the foot of the mountain, and said to Bai Yu: "Senior Bai Yu, the town in the northwest should be pointing to that place!"

"It should be!" Bai Yu is not very experienced in judging directions, so his answer is not very sure.

After that, Bai Yu and Tanjiro didn't stop too much, and followed the mountain all the way down to the flat ground. Then, the two of them continued walking along a dirt road on both sides of the field. Finally, the two of them came to one end of the river. On the other side of the river was the town.

There is a small dock on the edge of the river. There are many ships parked near the dock, and a lot of goods are piled on the dock.

As Tanjiro was traveling for the first time, he looked around curiously. This was the first time for Tanjiro to see a town of this size.

After all, Tanjiro is a child who grew up in the mountains. To put it bluntly, he is a country bumpkin with no knowledge.

Bai Yu didn't find this strange at all. After all, Bai Yu had lived in a modern metropolis and naturally had more experience than Tanjiro.

In this way, while looking at the town, Bai Yu and Tanjiro walked onto the wooden bridge and arrived at the other end of the river.

Bai Yu and Tanjiro continued walking along the streets of the town. Looking at the shops selling various things on both sides of the street and listening to the men and women standing on the street talking to each other, the atmosphere seemed so lively.

"Senior Bai Yu, how do you plan to find the ghost hiding in the town?" Tanjiro couldn't help but ask Bai Yu.

Hearing this, Bai Yu stopped moving forward, and then looked at a man walking around like a zombie.

At this time, someone on both sides of the street seemed to know this man, and there were comments from the crowd.