Tamayo nodded and said, "You should know that cells slow down their division rate under extremely cold or extremely hot external conditions."
"Demon blood is no exception."
"In other words..." Tamayo slightly raised her head, a glimmer of light in her purple eyes, "Mizuki, your blood now possesses the effect of replacing a scarlet blade."
"Replacing a scarlet blade..." Mizuki's expression was somewhat moved.
Now, the only drawback of her Blood Demon Art against demons was gone.
Moreover, it could be given to swordsmen who found it difficult to activate a scarlet blade, enhancing their offensive capabilities.
A scarlet blade is activated by using wrist strength to stimulate the sun energy within the Nichirin Blade, requiring unimaginable wrist strength.
After she successfully awakened her Demon Slayer Mark, she naturally mastered the Transparent World due to her improved swordsmanship, but she couldn't master the scarlet blade.
It was only during her battle with Kokushibou, when she was on the verge of death, that it erupted for a fleeting moment.
Later, after becoming a demon, her physical abilities improved, and only then did she fully master the scarlet blade.
In Mizuki's opinion, even if all the Demon Slayer Corps swordsmen of that era activated their Demon Slayer Marks, only two could successfully activate a scarlet blade.
Namely, the Stone Hashira, who had the strongest wrist strength, and the Sound Hashira, Uzui Tengen, whose wrist strength was second only to his.
Furthermore, after Uzui Tengen activated his Demon Slayer Mark, Mizuki had him try it, but unfortunately, even with the second-highest wrist strength among the Hashira, Uzui Tengen couldn't successfully activate a scarlet blade, even when his face turned red from straining.
In fact, after Uzui Tengen strained for a long time to no avail, he even doubted the truth of Mizuki's words. Of course... Mizuki demonstrated with his two swords what it meant to return a red blade after being handed a yellow one.
However, the fact that even Uzui Tengen couldn't easily activate a scarlet blade proves how difficult it is to activate one, not to mention something as profound as the Transparent World.
Mizuki's thought was that the 'three-piece set' could equip the entire team with Demon Slayer Marks before the final decisive battle. As for the Transparent World and the scarlet blade, she didn't intend to force it.
In desperate situations, those who can master it will naturally master it.
Ever since Mizuki learned about the effects of Blood Demon Art, she had thought about using it on Nichirin Blades to help others open up combat situations.
But after her later attempts, she found that when her blood was applied to the blade, the cold aura prevented the blade from heating up properly.
Because of this, she gave up the idea of extending her Blood Demon Art to others.
After all, an increase in sword energy range was not as effective as a scarlet blade for fighting Upper Ranks and Muzan.
But now, after Tamayo's explanation, she felt that her Blood Demon Art was viable again.
It seems she needs to find some demons to test her blade and see the effect.
Tamayo softly said, "If I'm not mistaken, the temperature of your blood should continue to drop."
"Why did it suddenly mutate now?" This was what Mizuki didn't understand.
There had been no changes for hundreds of years, only at this specific point in time.
"Hmm, I'm not quite sure about that." Tamayo's slender, pale fingers pressed against her lips. "But I suspect it might be related to your prolonged fasting."
"After such a long time without eating, even for a demon, the cells would have decayed to an extreme point. Suddenly eating could cause some changes in the body."
"But then again, when a normal person feels unwell, wouldn't they try to save themselves or find a doctor?"
Mizuki opened her mouth and retorted, "How would I find a doctor?"
Tamayo lowered her eyes, "You know that's not what I meant."
"It's truly amazing you could endure it..."
Speaking of which, Tamayo couldn't help but frown slightly.
Even for a demon, not eating for two hundred years was an unimaginable concept.
It wasn't that they wouldn't die, so nothing would happen.
Demons, the hungrier they are, the easier it is for them to lose their rationality.
This is also why most people lose their rationality for a period after first transforming into demons.
Because becoming a demon consumes internal energy, the stronger a person is, the longer it takes to become a demon, and the greater the consumption.
To maintain rationality under such circumstances can no longer be simply attributed to strong willpower; it must be inextricably linked to a special physique.
Otherwise, they wouldn't have had to modify their bodies to adapt to drinking blood.
Just endure it, right?
But even for the simplest act of enduring hunger, two hundred years is not something just anyone can bear.
Mizuki: "..."
Alright.
Say no more.
She already knew she was wrong.
Tamayo concluded, "In short, although I don't know the exact reason, it should be evolving in a good direction."
"You can pay more attention to your body's changes during this time. If you feel unwell, tell me immediately, or tell Miss Shinobu, it's the same."
Mizuki: "Oh."
She felt as if her best friend was particularly worried about her.
"Wait a moment." Having received Mizuki's affirmative answer, Tamayo casually said, then turned to rummage through the table.
"What are you looking for?" Mizuki idly surveyed the laboratory.
"The purpose of calling you here this time." Tamayo rummaged through something on the table without looking back.
Mizuki asked in confusion, "Purpose? Wasn't it about my blood?"
"..." Tamayo turned around, holding a syringe, and said helplessly, "The changes in your blood were just my initial hypothesis. Didn't I only determine the problem after you arrived?"
"Oh."
What's wrong with this child?
How come after two hundred years of not meeting, her mind is a bit dull?
Tamayo's gentle voice carried a hint of helplessness: "Hold out your hand for a moment."
"Hand?" Mizuki shivered, retracting her gaze from the laboratory, and looked at the needle in Tamayo's hand. "Aren't you not drawing blood?"
Tamayo: "It's an injection."
Mizuki paused: "Injecting what?"
Tamayo smiled slightly, teasingly saying, "Something interesting, it should surprise you."
"Alright, give me your hand." Tamayo beckoned.
Although Tamayo was being a bit secretive, the two had shared hundreds of years of hardships, and Mizuki completely trusted Tamayo.
Let alone injecting an unknown liquid, even if Tamayo told Mizuki to bang her head against a wall, she wouldn't frown.
Mizuki placed her arm on the table, and Tamayo pushed the syringe into her flesh.
"Alright, just wait a bit for the medicine to take effect." Tamayo retrieved the empty syringe and pulled down Mizuki's sleeve.
"Mm."
To prevent her from getting bored while sitting, Tamayo pulled out blood bags from the freezer: "Here, drink these blood bags first."
"Mm..." Something felt a bit strange.
She felt like a child visiting an adult neighbor's house for free food and drinks.
But... having food wasn't bad.
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