Hundreds of years ago, Tamayo, who was still human, suffered from a deadly illness that could not be cured with medicine. Later, she was deceived by Muzan due to her inability to control herself. After regaining her sanity, Tamayo deeply regretted her actions and ultimately overcame her Demon instincts through perseverance.
Because she was skilled in the field of medicine, to increase the chances of overcoming sunlight, Muzan forcibly took her as a servant. Tamayo knew she couldn't fight him, so she could only try her best to suppress her emotions and disguise herself around Muzan to find his weaknesses.
In the end, Yoriichi appeared, and Muzan was severely injured in that battle and fled. However, Tamayo ultimately lost control due to Muzan's rapid weakening, and she endured the pain of loss for a hundred years along with her feelings for Muzan.
To repay Yoriichi, she shared everything she knew about Muzan and his past. Yoriichi asked her to help the Demon Slayer Corps defeat Muzan. Although Tamayo was worried that as a Demon she would be executed by the Demon Slayers before she could take revenge, she ultimately agreed to Yoriichi's request.
To defeat an invincible monster like Muzan, Tamayo concluded that the only way to win was to turn Muzan back into a human, as she herself was a great doctor, while researching a remedy that could transform Demons back into humans.
Tamayo's origin was told by Shun to Kanae.
It can be said that Tamayo is a truly remarkable existence.
In particular, Kanae began to respect Tamayo even more after learning that the other party was working on a potion to turn Demons into humans.
"Lady Tamayo, I am Kocho Kanae from the Demon Slayer Corps. From now on, I will be responsible for bringing you back to the Butterfly Mansion to help you develop the potion that can turn Demons into humans."
Seeing the excited expression of Butterfly Kanae, Tamayo was slightly surprised.
For years, almost no member of the Demon Slayer Corps had been so kind to a Demon, or even had any respect.
Tamayo was a bit confused, but after talking with Kanae for a while, after understanding the thoughts of the leader of the Demon Slayer Corps, her eyes became softer as she looked at her, as if she were seeing a kind-hearted little princess.
"Takema-kun, I'm a little envious of you for having such a beautiful and kind wife." Tamayo joked, noticing the intimacy between them.
"I'm envious of myself too."
Shun pulled out several vials of blood from his hands.
"Lady Tamayo, this is blood from the lower string and the second string." Shun paused for a moment and then pointed to another vial, "And this vial is human blood. It likely consumed a Blue Spider Lily flower."
Shun's words changed Tamayo's expression.
She unconsciously grabbed his hand and nervously corrected, "Takema-kun, are you sure?"
"There's no guarantee, but the chances are high."
"In that case, let's set off now. I need to research the potion that can turn Demons back into humans in the safe environment of the Demon Slayer Corps' main house."
Tamayo tightly held his hand and looked at him pleadingly.
"Of course, Lady Tamayo, please clean yourself up and bow, and we will set off tonight."
With that, Shun looked around and seemed not to see Yushiro in the original work.
"Are you alone, Lady Tamayo?"
"What's wrong? I've been alone all this time."
Tamayo felt strange hearing Shun's words.
"Well, it's fine. I just thought Lady Tamayo would surely feel lonely if she was alone for so long... I hadn't thought about it…"
Shun didn't pay attention to such trivial details but became concerned about the other party.
However, as he spoke, his waist began to ache.
"Shun…" Kanae pinched his waist and complained softly, "I'm still here…"
"Hehehe… I only care about Lady Tamayo."
Shun smiled and held Kanae's small hand.
"Lady Tamayo is already packed, let's go."
❀❀❀
The three of them left Kyoto.
After seven or eight miles, as the carriage swayed toward the main house of the Demon Slayer Corps, Shun suddenly stopped the carriage.
"Kanae, you and Lady Tamayo go back to the Butterfly Mansion first."
This time, there was rarely seen anticipation and fighting spirit in Shun's eyes.
"The best sharpening stone to understand the Transparent World and martial arts is here. When I kill Akaza, Lady Tamayo will have one more vial of blood for research."
After saying that, Shun jumped out of the carriage and stared at the person in front of him with burning eyes.
With his hands folded in front of him, Akaza approved the departure of the two women in the carriage.
Although Muzan's orders were strict, and he had turned into a Demon, he always had a certain obsession in his heart that made him never kill or eat women.
The carriage gradually moved away and disappeared at the end of the road.
Seeing this, Akaza lowered his hands, stared at Shun, and released a suffocating and terrifying fighting spirit.
"You're the one who defeated and killed Doma, right? A truly formidable opponent."
Akaza took a martial artist's stance, mounted, and made hand movements, causing a formation of twelve snowflakes to appear beneath his feet.
"Destructive Death!"
The array of snowflakes emitted light, making his pair of golden eyes shine with a golden glow.
But Shun did not draw his sword; instead, his eyes once again transformed into Mangekyo Sharingan.
"Akaza, you must be the strongest Demon in the world in physical skills. I hope you won't disappoint me."
After that, the six-pointed star of blood began to spin!
Tsukuyomi!