Multiverse: Why does the world show a health bar? !

It seemed as if all the sins of the world had been concentrated in Muzan Kibutsuji. After the death of this progenitor of demons, everything became beautiful, as if the house had been thoroughly cleaned for the New Year, fresh and new.

It was a scene full of vitality, where all things thrived.

Where there is joy, there is also sorrow.

The former is abundant, the latter scarce.

But that doesn't mean the latter doesn't exist.

Yushiro is one of those few. Or rather, the only one.

After Li Mo left that day, Yushiro followed Tamayo and collaborated with the Demon Slayer Corps. They moved into the basement of the Butterfly Mansion, providing intelligence and medical knowledge to the Demon Slayers.

Of course, apart from the Hashira, a few swordsmen, and some members of the Kakushi, most members of the Demon Slayer Corps were unaware of the existence of these two demons. Even though Tamayo had turned over a new leaf, and even though Yushiro was the only demon in the world who had never eaten a human.

A demon is still a demon.

Generally speaking, many swordsmen couldn't accept demons as their companions.

The most typical example is Sanemi Shinazugawa.

The two demons had undergone Sanemi's tests and were vouched for by the leader before they were accepted.

From Yushiro's perspective, Muzan Kibutsuji's death should have been a cause for celebration. That demon king was also Tamayo's enemy.

But Muzan's death meant something else.

—The death of Tamayo.

"It seems Yushiro really doesn't want to see me."

"If you know that, then why are you here?"

Yushiro's mood was already bad, and now it was even worse.

Because a certain famous swordsman had appeared before him.

A once-in-a-millennium genius, the inheritor of Sun Breathing, the slayer of the demon king...

The man before him had many titles.

But Yushiro still didn't like his presence.

They had never gotten along... and now, the swordsman named Li Mo appearing here meant something else.

"Probably because this is the last thing I need to take care of."

Li Mo spoke, knowing full well the source of Yushiro's hostility.

Because he was here to kill Tamayo.

That was the agreement made long ago. Originally, it was just a jest, but after he returned and killed Muzan Kibutsuji, even a joke had become reality.

In the original story, Tamayo chose to be devoured by Muzan Kibutsuji, injecting various toxins into the demon king's perfect body.

Among them was even a poison that accelerated aging. Seeing this formula, Li Mo couldn't help but admire Tamayo's knowledge, accumulated over hundreds of years, which placed her at the pinnacle of pharmacology in this world.

In the future, the Butterfly Mansion could benefit greatly from her legacy.

But no amount of knowledge could soothe the sorrow and resentment in her heart.

"Hmph!"

Yushiro had nothing more to say, only giving Li Mo a sour look.

Li Mo could swear to the heavens that he had never seen Yushiro with such an ugly expression. He even had the urge to punch the kid because that face was just too infuriating.

But considering that the person Yushiro loved was about to die by his hand, a sense of pity restrained that impulse.

"Yushiro, don't be rude to Mr. Li."

A woman's voice echoed in the room. Currently, the Butterfly sisters and Makomo were busy in the Butterfly Mansion above ground. The only woman who could be here was Tamayo.

From her appearance, this doctor was a noble woman, embodying the word "maturity." Graceful and dignified, she was like the matriarch of a household.

In front of Tamayo, Yushiro became meek and said nothing more.

He always respected Tamayo's decisions. That was why he only gave Li Mo a dirty look instead of outright kicking him out.

In fact, even if Yushiro had been more aggressive, Li Mo would have accepted it.

"Mr. Li, are you here to fulfill our agreement?" Tamayo asked the swordsman.

"Yes," the swordsman replied.

"Good."

Tamayo nodded. She showed no fear of the impending agreement, but rather, a hint of anticipation.

"Then, Mr. Li, do you remember our agreement from back then?"

"Miss Tamayo, of course I remember. I once said that if one day, after Muzan Kibutsuji's death, you were still alive in this world, I would gently sever your neck."

The agreement.

Li Mo had not forgotten it. On the night Muzan Kibutsuji died, as Li Mo followed Shinobu to the temporary base to help treat the wounded, he had a brief, private conversation with Tamayo. That conversation brought this agreement back to the surface of his memory.

In truth, Li Mo wished he could forget.

The man asked in a low voice, "But, before that, Miss Tamayo, do you truly have no attachment to this world left? With your abilities, you could develop a drug to turn demons back into humans, couldn't you?"

In the original timeline, it was this very doctor who, alongside Shinobu, developed the drug to turn demons back into humans, successfully restoring Nezuko to her human form.

Now, Tamayo had two paths before her: one was a broad road, using her expertise to develop the drug and live out her life as a human. The other was a narrow path, dying as a demon and going to hell to atone for her sins.

Tamayo chose the latter.

And Li Mo believed she could choose the former.

Compared to other demons who had abandoned their humanity, Tamayo and Yushiro were different.

"Mr. Li, I have already made my choice."

Centuries of life had not brought her joy, but rather a heavy burden. The smiles of her children still vivid in her memory, how could Tamayo forget that it was she, as a demon, who had killed her own children? Pain and resentment tormented her day and night.

—Ending Muzan Kibutsuji was the meaning of her existence.

With Muzan's death that night, she too would die.

"Alright. Where should we do it?"

"Please, right here. I don't mind."

Tamayo said, turning to Yushiro. "Yushiro, please remember. No matter what, this is my choice. I'm sorry..."

What needed to be said had already been said. There was no point in repeating it now.

"Please, begin."

"Alright."

Li Mo hesitated no longer.

The Nichirin Blade appeared in his hand from the inventory.

Breathing—

Swing.

The air seemed undisturbed, as if nothing had happened. The underground space was eerily quiet.

Finally, the sound of the Nichirin Blade returning to its scabbard echoed.

Following that, Tamayo's head and body separated, no longer connected. The power of the sun within the Nichirin Blade severed the demon's regenerative abilities.

Tamayo's health bar was rapidly depleting. Her body could no longer sustain itself. Yushiro hurriedly supported her body and head.

"As expected, it doesn't hurt at all."

Tamayo's final words in this world were an admiration of Li Mo's swordsmanship.

Finally, her body, her head, all turned to ash. The individual known as Tamayo disappeared before Yushiro and Li Mo.

Yushiro knelt on the ground.

He thought he could endure Tamayo's departure.

—Thought.

Often, what we think we can endure doesn't come true.

"Yushiro, go learn painting."

"Use a brush to record Miss Tamayo's appearance."

"That way, she can exist forever in this world."

Li Mo left this advice. Then, he gave Yushiro the space to reflect on his own.

"Li Mo. You said you're an onmyoji. Does reincarnation truly exist in this world?"

"Yes! Of course it does!"

Li Mo replied with unwavering certainty.

Then, his figure disappeared up the stairs leading to the surface.

In the underground laboratory, only one person's wails and pain remained.