A person in Japan, a sword that soars to immortality.

Yoshiwara, early morning, the sky is cloudless, and the moon is full in the sky.

"Plain clothes! Here!"

He Yi leaned on the windowsill, cupped her hands to her mouth to make a megaphone shape, and called out to her younger brother, who was walking slowly towards her from the other end of the street, with a look of joy on her face.

Just as Su Yi was about to reach the bottom of Yan Yanlou, she suddenly stopped and stared at the front with a ferocious expression.

"How could this be? Is there something... Ah!"

Following the direction Su Yi was looking, He Yi discovered that at the other end of the street, there was a samurai dressed in a white haori with flame embroidery at the end, silently watching him.

Demon Slayer Corps samurai! Demon Slayer Corps samurai with completely different attire!

He Yi covered her mouth, staring wide-eyed at the warrior, her hair standing on end, her back stiffening, and even her breathing becoming somewhat labored.

Since Su Yi became a demon, she has encountered the samurai of the Demon Slayer Corps.

She was incredibly nervous when they first met, but only relaxed after Su Yi's almost magical magic sliced ​​her into several pieces.

From then on, every now and then, a samurai would appear in the middle of the night to kill Su Yi.

Gradually, she learned that these samurai were from an organization called the Demon Slayer Corps, and their purpose in coming to Yoshiwara was to kill her younger brother!

"This time, my little brother should be alright, right... Hmm!"

He Yi clasped her hands in front of her chest and muttered to herself. Before she could even make contact, a hand suddenly reached out from behind her and covered her mouth.

"Your brother is probably in danger this time."

Unbeknownst to them, Taiyi, who had already awakened, was standing behind Heyi, using the system to scan the data of the two people on the street.

Name: Su Yi

Age: 16

[Life span:? ? ? 】

[Essence: 187.7]

Qi and Blood: 181.3

【God Soul: 51】

"So He Yi has a younger brother named Su Yi. The names of these two sisters are quite interesting, one red and one white, like a pair of 'red and white demons'?"

"But no matter how meaningful the name is, it can't make up for the difference in combat strength..."

Taiichi couldn't help but turn his gaze to the Demon Slayer Corps samurai.

Name: Rengoku Matsujuro

Age: 26

【Lifespan: 42】

[Essence: 123.9]

Qi and Blood: 265.1

【God Soul: 17】

Taiichi raised an eyebrow; Rengoku Matsujuro's health points of 265 almost blinded him.

This was the warrior with the highest Qi and Blood value he had ever seen among humans, even higher than Shugen.

However, in comparison, the value of Shuxian's essence is also much higher than that of the opponent.

"Is it because of the breathing technique? I'll take this opportunity to observe and confirm my thoughts."

Taiichi squinted and quietly watched the two people on the street.

On the other side, Su Yi saw He Yi suddenly pulled back into the room by a hand, and then a handsome man appeared behind the window, with several veins bulging on his temples.

"Damn it, put down the Hei Yi!" After saying this, he immediately leaped into the air and rushed towards Taiyi.

"You man-eating demon, now that I stand here, I will not allow you to harm anyone!"

"Breath of Flames, Second Form - Ascending Blaze!"

Whew!!

Matsujuro quickly arrived below the plain-clad figure, and then, with his Nichirin Blade blazing with flames, he slashed upwards at her.

"roll!"

Just as he was about to save He Yi, a sudden attack stopped him from doing so.

Seeing Taiyi's emotionless eyes, Suyi raised her head, her back teeth grinding together, and then, with a ferocious expression, she met Matsujuro's blade with a claw strike.

Ding!

Sparks flew as five white energy blades emerged from the fingertips of the woman in plain clothes, transforming into sharp attacks that clashed with the Nichirin Blade.

But Matsujuro the Flame Pillar's attacks certainly didn't stop there.

"Breath of Flames, Third Form - All Forms of Flame!"

The previous strike was an upward slash, but this time, after leaping to the same height as Su-i, Matsujuro followed up with a downward slash.

As the two landed on the ground and resumed their back-and-forth attacks, Taiichi's expression gradually became serious.

It wasn't because of their fighting strength, but because Taiyi discovered that the Flame Pillar's essence level was gradually decreasing with the use of breathing techniques, while his blood energy was gradually increasing, but...

"Is Su Yi's Blood Demon Art a Wind Blade? Not bad, but the Flame Pillar's essence value shows no signs of recovery; it's a permanent loss."

Taiyi thought to himself.

They also have their own breathing techniques and methods for converting three-dimensional data.

However, compared to the Demon Slayer Corps' breathing techniques, one cannot create permanent changes.

"That's a fighting style that burns through one's lifespan, but the legendary Yoriichi Tsugikuni is unaffected by it. How did he do it...?"

He had only been pondering this for half a moment when a piercing pain suddenly shot through his hand that was covering the ochre robe.

Seeing the hand bleeding from being bitten so badly by the other party, Taiyi's face immediately darkened. He then raised his hand high and brought it down hard on Heyi's hand.

Snapped!

"Ugh... Ugh!???"

He Yi instinctively closed his eyes and shrank back, waiting for the other person's large hand to slap him hard across the face.

Even so, she did not intend to give in, but was determined to break free from Taiyi's control.

However, the reality was somewhat unexpected; Taiichi did indeed hit her, but he didn't hit her face...

Snapped!

Taiyi: "Let go of my mouth."

He Yi: "Ugh!"

Snapped!

Taiyi: "I'll count to three, then let go of me, and hurry up!"

He Yi: "Ugh!"

Taiyi: "Oh my god, okay."

Snapped!Snapped!Snapped!

"Stop hitting me! Stop hitting me! I was wrong!"

He Yi released her mouth, her cheeks flushed, and she apologized to Taiyi with teary eyes, feeling a burning pain in her buttocks.

My butt! It's cracked! It's absolutely cracked!

"Alright, we've learned what we needed to know. Now we have more important things to do."

Taiyi released his control over Heyi, who was clutching her buttocks and staring blankly at him.

"Where...where are you going?"

He Yi pursed her lips, puffed out her cheeks, and stared at Taiyi with a fierce look.

"Going to negotiate is also to prevent the problem of missing persons from happening again in Yoshiwara."

Taiyi said calmly.

What?! He's going to help that samurai and hurt Su Yi!

"Even if I lose my life, I will not let you hurt Suyi!" Heyi stood up instantly, prepared to lose her life, and spread her arms to the sides to block Taiyi.

"Save your breath." Looking at the surging, snow-white waves that seemed to threaten to engulf him, Taiyi placed his hand on Heyi's face and pushed her aside.

“Your brother is no match for me. The two I’m going to find are the biggest threat to Yoshiwara.”

After saying that, Taiichi walked to the window and squinted at the direction of Inamoto-ro.