"That's how it is. Not only have my lung injuries completely healed, but I also feel much stronger overall. It's like being reborn."
While Mizuki spoke, she flexed her bicep, her body language quite expressive.
Still the same as before... Yoriichi first smiled reassuringly, then adopted a serious expression and said, "Mizuki."
"Hm?"
"Don't let this power go to your head. The power of a Demon must be used with caution."
Seeing her older brother look so serious, Mizuki also suppressed her smile and replied sternly, "Yes, I know."
Overusing a Demon's power indeed leads to a major problem.
That is weakness.
Once a Demon is weak, the desire to feed quickly becomes strong enough to completely dominate their mind.
And Demons, in pursuit of strength, will also eat humans.
No matter how she looked at it, Yoriichi's concern was justified.
Because Michikatsu chose to become a Demon and abandoned his humanity precisely to pursue strength and to become stronger than Yoriichi.
With Michikatsu's precedent, Yoriichi naturally paid even closer attention to Mizuki.
But as soon as this topic came up, she started to drool a little.
Yoriichi was momentarily stunned looking at the saliva dripping from his sister's mouth.
Mizuki quickly sucked it back in and looked at Yoriichi awkwardly.
"Um, Brother..."
"Yes?"
"I haven't eaten anything for several days."
"Then I'll go make you..." Yoriichi was about to stand up when he suddenly realized, "What... what do you need to eat?"
Mizuki looked at him with fervent eyes.
Yoriichi: "..."
Mizuki clasped her hands together, "Blood! Please, I only need a little bit of blood!"
I have to say, Michikatsu was extremely considerate of her.
Fearing she would be weak and hungry after turning into a Demon, he deliberately left Namiko behind.
He didn't even kill her directly, worried that what she ate wouldn't be fresh.
So, it seems it wasn't without influence after all?
Yoriichi lowered his eyelids slightly, sighed, and said, "Mizuki, we still can't confirm whether you are different from other Demons."
"Therefore, you must live with me from now on."
At least he needed to observe her.
Mizuki was slightly stunned, then stated matter-of-factly, "I don't have anywhere else to go anyway."
"Besides, I'm counting on you to teach me swordsmanship so I can get revenge on Michikatsu."
"That bastard kept choking me and asking if I wanted to become a Demon," Mizuki said, her eyes turning dangerous and her voice vicious. "One day, I'm going to beat him until he's spitting out teeth!"
Yoriichi: "..."
Well, she really hasn't changed.
Yoriichi picked up the nichirin blade beside him and drew the sword.
This small action, though carrying no imposing pressure or aura, made Mizuki instinctively freeze up completely.
The Scumbag Boss's cells were causing trouble inside her again.
Yoriichi paid no attention to his sister's reaction and gently sliced open a cut on his hand.
"Is this enough?"
There is an old saying: Food is the most important thing in the world.
The desire to eat ultimately suppressed the fear induced by the muzan cells.
"Yes, yes!" Mizuki nodded vigorously, stepping forward to cup his hand and catch the blood.
Just as Mizuki lowered her head, intending to taste it, she suddenly paused again.
Yoriichi asked with concern, "What's wrong?"
"Nothing." Mizuki shook her head.
She just remembered the meme about Yoriichi being the embodiment of the Sun God, and wondered if drinking his blood would incinerate her.
Such a thought had inexplicably popped into her head.
Fortunately, it wasn't that ridiculous.
It tasted quite delicious, like a sweet rain after a long drought.
Although it certainly couldn't compare to eating a human, at least she had a snack.
She really couldn't live like this; it was too miserable.
If eternal life meant living like this, she would rather refuse it. The constant feeling of hunger was too painful.
She wondered what Miss Tamayo was doing now.
Mizuki thought that after Miss Tamayo was saved by Yoriichi, she seemed to stop eating human flesh. When Tanjirou met her in the future, he didn't smell the foul stench of a Demon on her.
Miss Tamayo seemed to survive on human blood as well, and given her status, obtaining it was relatively easy.
Should she go and seek refuge with Tamayo?
Maybe work for her to earn some meals.
Miss Tamayo is an actual Physician; wouldn't that count as being part of the system?
At least it would be much better than being an unemployed vagrant who can only leech off family at home.
Sigh.
Mizuki sighed.
Yoriichi tilted his head, finding the shifting expressions on his sister's face inexplicably cute.
If he ignored the fresh blood on her mouth and hands, that is.
Yoriichi's blood barely filled Mizuki's stomach, and her complexion regained some color.
Looking at the cut on Yoriichi's wrist, Mizuki smiled playfully.
"Brother, how about I show you a magic trick?"
"A magic trick?"
Mizuki picked up her broken nichirin blade and lamented, "It's a pity, after being with me for so many years."
Yoriichi said calmly, "This sword isn't actually suitable for Snow Breathing."
Mizuki nodded, "I know."
Breathing Techniques and Sword Forms must match, and the execution of a Sword Form is often inseparable from the blade.
This nichirin blade was one Mizuki was already using when she joined the Demon Slayer Corps, before she had mastered Snow Breathing.
It was more suitable for the Five Great Breathing Styles.
Snow Breathing originated from Wind and Water Breathing, but it also incorporated techniques like Thunder Breathing and Sun Breathing, making it currently the most complex Breathing Technique.
Ordinary blades simply couldn't match it.
Moreover, as Mizuki's lungs were damaged, she never performed external missions again, so there was naturally no need to replace the nichirin blade.
Thus, she has used this sword until now.
Mizuki used the broken blade to slice open a cut on her wrist. Yoriichi opened his mouth, hesitating to speak.
"Brother, your hand."
Yoriichi obediently held out his hand.
Mizuki applied her blood to Yoriichi's wound, and the cut healed at an astonishing speed.
Under Yoriichi's surprised gaze, the wound on Mizuki's own wrist had also healed. She explained, "This is the Blood Demon Art I awakened."
"It can rapidly restore injuries."
"It can even regenerate severed limbs."
In Mizuki's voice, there was a hint of subtle confidence.
This power would definitely be useful in the future.
If humans possessed the same regenerative power as Demons, what advantage would Demons have left?
She didn't know if it was due to the special nature of the blue spider lily or if Michikatsu had injected a sufficient amount of Muzan's blood into her body.
Regardless, both the regenerative power granted by the Blood Demon Art and Mizuki's own recovery ability far surpassed that of an ordinary Demon.
Seeing the wound restored, Yoriichi nodded slightly, "It is indeed a powerful ability."
"Right, and it's not just useful for that." Mizuki ran her palm over the nichirin blade, coating the sword body in a layer of fresh blood.
The blood spread unnaturally along the blade, almost uniformly turning the edge crimson.
"My blood can also enchant weapons, increasing the power and range of Sword Forms."
This aspect was somewhat similar to Michikatsu's Blood Demon Art; although not as convenient as his, it wasn't far behind.
More importantly, her ability could be used on others.
She, Mizuki, was the All-Purpose Healer!