After encouraging Tanjirou, Mizuki found Kochou Shinobu, informed her, and then headed out toward Tamayo's laboratory.
With Tanjirou there, she didn't need to worry about Giyuu's matters... Upon arriving at Tamayo's laboratory, Yushiro looked at her with a somewhat displeased expression, likely because of what she had said last time.
"Excuse me." Mizuki didn't mind, knocked on the door, and entered the laboratory after receiving Tamayo's permission.
"Are you busy?" Mizuki paused mid-sentence, seeing Tamayo sitting at a table inside the laboratory, tasting tea.
Tamayo turned and smiled slightly at her: "No, everything that needed to be done has already been completed."
"I see..."
"Sit down." Tamayo pointed to the spot in front of her, poured tea, and pushed it across the table.
"Thank you." Mizuki sat down, took a small sip, and asked, "Did you need to see me about something?"
Tamayo put down her teacup and nodded gently: "Yes, it concerns your blood."
"The Final Battle is imminent. Starting now, we will store your blood to be used as recovery medicine during the war, which can minimize casualties among the Demon Slayer Corps personnel."
Mizuki paused slightly in surprise: "Of course. Are we starting now?"
The idea of using her blood as a recovery medicine for the Final Battle had been on her mind ever since she learned her blood had this effect.
In fact, Mizuki wanted to do this immediately after they re-established contact with the Demon Slayer Corps.
Although she is just one person, as long as there is enough sustenance, a Demon's blood can maintain infinite regeneration.
There is no need to worry about needing a period of rest after drawing blood, unlike normal humans.
But Tamayo had stopped her at the time.
If Muzan noticed this ability too early, it might cause unnecessary trouble.
Mizuki probably hadn't thought of it herself, but Tamayo felt that Mizuki's ability was even stranger than overcoming the sun.
The ability to heal human injuries.
This ability is not just of little use to Demons; it's completely useless.
Yet, Mizuki somehow developed such an ability.
Tamayo lowered her eyelids slightly: "If you are alright with it, although you will have sufficient energy replenishment, it will likely leave you weak for a few days."
"It's fine." Mizuki shook her head.
Coincidentally, Tanjirou will still be bothering Giyuu these few days, and the Special Training has just begun, so waiting a few more days won't be a big issue.
Tamayo nodded and called Yushiro in from outside the door: "Get the things ready."
"I understand, Lady Tamayo." Yushiro moved the blood-drawing syringes and several boxes of test tubes for storing blood onto the laboratory table.
He looked at Mizuki, a hint of schadenfreude flashing in his eyes.
Looking at the pile of test tube boxes on the table, Mizuki's mouth twitched slightly.
Well, she was already starting to feel dizzy.
Tamayo stood up and prepared the syringe, then turned to Mizuki: "Are you ready?"
Mizuki nodded reluctantly, moved her chair to the laboratory table, placed her Hand on the surface, and turned her head away, unable to watch.
Tamayo smiled: "Don't worry, we won't let you collapse this time."
After she finished speaking, Yushiro carried box after box of blood from the refrigerator and placed them beside her.
Mizuki's eyelid twitched, having already figured out the subsequent process.
It would probably be—Draw blood—Drink blood—Draw blood—Drink blood... The Perpetual Motion Princess is complete.
Like this... Mizuki drank the blood in the test tube in one gulp. The fresh blood moistened her lips, but could not hide their pallor.
"Still not enough?" Mizuki seemed to have faint dark circles under her eyes.
Even with blood replenishment, she was close to being drained dry.
Blood, for a Demon, really cannot be eaten as a main meal; it can only barely satisfy hunger.
A little movement makes one hungry, let alone needing constant blood regeneration.
"The Demon Slayer Corps has hundreds of Swordsmen, and I want to ensure that every Hand receives at least one dose." Tamayo focused intently on drawing blood from Mizuki's arm.
If Mizuki didn't have such powerful regenerative abilities, her arm would surely be covered in dense needle marks.
Mizuki nearly blacked out upon hearing that. Hundreds of doses?
How many doses had been drawn already?
Perhaps due to drawing too much blood, Mizuki's head felt fuzzy, so she simply stopped overthinking, lowered her head, and closed her eyes to rest.
She was no Saint, but she would not refuse to do what was within her power.
She only needed to endure a little weakness and discomfort, and she might save a vibrant life in return.
This kind of trade was a sure win.
The temperature in the laboratory seemed to have dropped significantly; even though it was a hot day, Tamayo exhaled a puff of white air and stiffly flexed her fingers.
Mizuki's blood was colder than she had imagined.
Although the blood hadn't congealed, a thin layer of ice had formed on the surface of the test tubes.
Tamayo looked at the number of test tubes, lowered her head, and continued drawing blood... After an unknown amount of time, Mizuki was soundly asleep, drifting in a daze.
"Mizuki, Mizuki? Wake up..."
"Huh?" Mizuki opened her eyes groggily, glanced around, and saw that Yushiro was gone. "Did I fall asleep?"
Tamayo's smile came into view: "Yes, I almost couldn't wake you up."
Mizuki rubbed her temples, her brain throbbing painfully: "I feel like I'm about to die."
Tamayo asked with concern: "Do you feel hungry?"
"..." After a moment of silence, Mizuki rolled her eyes, "When you didn't ask, I didn't feel anything at all."
Tamayo smiled and handed her a test tube of blood.
Mizuki downed it in one gulp.
"Do you feel better?"
"I think so."
..."No, it seems completely useless." Mizuki wiped her face with difficulty.
She was still very hungry, and her head was extremely uncomfortable.
It was like not sleeping for many days straight; her brain felt a tearing pain.
Tamayo said softly: "Even for a Demon, this level of blood depletion and regeneration is bound to be uncomfortable."
Mizuki shook her head: "It's fine, I can endure it."
Yes, Tamayo was certainly confident in Mizuki's endurance.
After all, she managed to endure two hundred years without eating.
Even accounting for the uniqueness of her Physique, Tamayo found it unbelievable.
It absolutely could not be done without an iron will.
Tamayo suddenly changed the subject: "Mizuki, there is actually one more thing I called you here for."
"..." After a moment of silence, Mizuki looked down at her own body, "What else do you want to dismantle?"
She felt the need to consider it carefully now.
Tamayo patted the back of her Hand, laughing wryly: "It concerns your physical condition."
"?
Tamayo didn't explain, but instead asked cryptically: "Mizuki, you want to continue staying by Young Miss Kochou's side, right?"
Mizuki was momentarily dazed by the sudden shift in topic: "What do you mean?"
"If Muzan is slain, the Demons born because of him will also vanish." Tamayo placed her Hand over her heart: "You are different from Yushiro and me. We modified our bodies, so even if Muzan dies, we probably won't disappear."
Mizuki was stunned: "Are you saying that I might die along with Muzan's disappearance?"
Tamayo lowered her eyelids slightly: "I cannot rule out that possibility."
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