Chapter 1: Unlocking The System

Mount Sagiri

A twelve-year-old boy had arrived here.

The child was dressed in tattered clothing, his face covered in dirt, yet his eyes carried a determination unbefitting his age.

His name was Zhou Yi, a transmigrator who had died of overwork as a 007 employee, only to wake up in the world of Demon Slayer: Kimetsu no Yaiba .

Zhou Yi had transmigrated with a system, though it remained locked until he found a master.

"Mr. Urokodaki should live here."

Zhou Yi carefully surveyed his surroundings, which matched the scenes in his memory almost perfectly.

Today, Zhou Yi had come to formally become an apprentice.

"Who are you? What are you doing here?"

At that moment, a man wearing a tengu mask appeared abruptly, his voice low and stern.

There was no mistaking it—this signature mask for warding off calamities confirmed the identity of the man before him. He was undoubtedly Urokodaki Sakonji.

Zhou Yi adjusted his ragged clothing and explained his purpose.

"My name is Zhou Yi. I wish to become your apprentice and learn how to kill demons."

"Zhou Yi?"

"I came here with my parents for business, but they were killed by demons... leaving only me," Zhou Yi said, his tone sorrowful, his eyes brimming with unshed tears.

Hearing this, Urokodaki Sakonji let out a long sigh.

The Demon Slayer Corps wasn't an official organization.

Most of its members were orphans like Zhou Yi, survivors of demonic attacks.

Only such individuals possess the resolve to risk their lives to slay demons.

For this reason, Urokodaki did not refuse.

"You will face a series of grueling training sessions. Can you endure it?"

Urokodaki's response made Zhou Yi's eyes light up.

"I will endure it, Master!"

[Apprenticeship detected. Heroic Spirit Legacy System has been unlocked.]

[Generating a beginner's gift pack…]

[The beginner's gift pack has been successfully generated. Claim now?]

"Claim."

Without a moment's hesitation, Zhou Yi made his choice.

[The beginner's gift pack is being issued.]

[You have received: unlimited food reserves, unlimited drinking water, 10 cubic meters of storage space, and the inheritance of Sasaki Kojiro (current inheritance rate: 0%).]

[Sasaki Kojiro: A human who reached the pinnacle of swordsmanship. Signature move: Tsubame Gaeshi.]

[Tsubame Gaeshi: A dimensional-folding attack that unleashes three slashes simultaneously, transcending the concepts of time and space. It is an attack that surpasses human limits, impossible to evade when fully executed.]

[Ultimate mission for this world unlocked. Completing it will unlock the next world.]

[Note: After leaving the current world, you may return by paying a certain price.]

[Ultimate Mission for this World: Kill Kibutsuji Muzan.]

[Mission Description: Within ten years, you must personally eliminate Kibutsuji Muzan.]

[Mission Reward: Unlock the next world and receive one million exchange points.]

All of this occurred in an instant. As Zhou Yi followed Urokodaki Sakonji toward the small hut, he browsed the system's notifications in his mind.

"What the heck!"

Zhou Yi almost shouted aloud.

In the world of Demon Slayer: Kimetsu no Yaiba , receiving the inheritance of Sasaki Kojiro couldn't be more fitting!

The pinnacle of swordsmanship!

More than enough to conquer this world!

Suppressing his inner excitement, Zhou Yi followed Urokodaki Sakonji to a small hut.

"Master, you're back!"

"Who's this?"

"Is he my junior disciple?"

A beautiful young girl with medium-length dark green hair peeked out, curiously observing Zhou Yi.

Despite Zhou Yi's current disheveled state, his refined features still elicited repeated admiration from the girl.

Urokodaki Sakonji coughed twice, signaling her to stop embarrassing herself.

"Makomo, this is Zhou Yi. From now on, he'll be your junior disciple."

"As his senior, you must take care of him! Stop acting like a child!"

Makomo stuck out her tongue shyly. "Got it, Master!"

The moment Zhou Yi saw her, he immediately recognized her. This was Makomo—the senior disciple of Giyu Tomioka and Sabito.

"This means the timeline I'm in is at least 5 years before the events of the main story!"

"If that's the case, I might be able to save many lives!"

Clenching his fists, Zhou Yi made a firm resolution.

[A long-term mission has been issued: With Great Power Comes Great Responsibility.]

[Mission Description: Save as many characters tied to the story as possible and change their fates.]

[Mission Rewards: Rewards will vary based on the character's importance.]

"What exactly qualifies as a story-related character?" Zhou Yi asked.

[For example: Saving Kanae Kocho from Upper Moon Two, Dōma, will grant you 10,000 exchange points.]

[Alternatively, saving Kyojurō Rengoku during the Mugen Train incident will also grant 10,000 exchange points.]

[Hint: Saving these two characters will yield the highest mission rewards.]

"And the lowest reward?"

[Preventing the young Serpent Hashira from being disfigured will earn you 1,000 exchange points.]

[Saving Demon Slayer members during the Mount Natagumo incident will also earn you 1,000 exchange points.]

Zhou Yi quickly grasped the system's reward structure.

The more popular the character, the higher the hidden exchange points!

"This matches my goals perfectly. These exchange points are mine!"

Urokodaki Sakonji patted Zhou Yi on the back and pushed him toward Makomo.

"Don't just stand there. Go with Makomo and take a bath. I'll find you some clean clothes."

With that, Urokodaki turned and left.

Makomo smiled brightly and readily agreed.

"Alright! I'll take Junior Brother to get cleaned up!"

Makomo led Zhou Yi to the bathing area.

"You can start bathing now," she said.

Zhou Yi nodded in acknowledgment but turned to stare at her, waiting for her to leave.

Makomo showed no intention of leaving.

"What are you waiting for? Hurry up and undress!" she said, puzzled.

"Aren't you going to leave, Senior Sister?"

Although Makomo was only 14, her figure was already well-developed. Zhou Yi felt awkward.

"You're just a kid! Of course, Senior Sister has to help you bathe!"

When Urokodaki Sakonji returned with clean clothes, he saw a freshly bathed Zhou Yi and a damp Makomo with water stains on her clothing.