When she was human, Ubume would always reveal the information that she was "being domestically abused by her husband" to nearby villagers.
Thus creating for herself the image of a pitiful woman suffering domestic violence, to win the villagers' attention and sympathy, and ultimately achieve the purpose of satisfying some twisted craving in her heart.
Toward this kind of distorted mental state, Mitsuba initially didn't quite understand.
It's worth mentioning that Ubume's husband later died from drowning after accidentally slipping and falling into a river on a rainy day.
Although many villagers living nearby at the time believed this was likely Ubume's act of resistance after being unable to endure her husband's violence.
Mitsuba was certain that in this matter, Ubume was actually innocent.
Because Mitsuba had seen Ubume's karma threads—she truly did nothing that day. Her husband really did accidentally slip and drown himself.
But regarding her daughter's matter, it was a different story.
Ubume and her husband had a young daughter before his death. After her husband's accidental death, unable to obtain that twisted satisfaction from domestic violence anymore, her heart began to become even more distorted.
In order to regain the villagers' attention and sympathy, she attempted to reshape herself into the image of a "pitiful widow struggling to care for her seriously ill daughter."
However, her daughter was not originally seriously ill—so how was she to obtain a "seriously ill" daughter?
The answer was simple: do the operation herself.
Thus, in order to maintain her new image, to satisfy that twisted pleasure in her heart.
Ubume began the twisted behavior of repeatedly torturing her daughter, then repeatedly treating her.
And in this process, gradually transformed from her former role as "victim" to "abuser."
Until one day, her daughter finally could no longer endure this torture. While attempting to escape, she was discovered by Ubume, who ultimately buried her alive.
At that time, Mitsuba—who was wandering around the streets being a loafer—happened to witness this scene.
Out of a small kindness of "doing one good deed daily," Mitsuba intervened and saved this poor little girl.
Simultaneously, through the karma threads on Ubume, she thoroughly understood the distortion in her heart.
Due to coming from wealth, plus her parents' early death, and being alone for a long time, Ubume's heart had already become twisted from a young age, filled with loneliness far exceeding ordinary people.
She desperately craved attention and sympathy from others around her, to the point that she married early.
Ubume's tolerance of her husband's domestic violence, her torture of her daughter, and the consecutive pitiful images she created for herself were all essentially means to win others' attention and sympathy.
In her cognition, a happy, fulfilling, and completely uneventful family was impossible to obtain others' attention.
Only tragedy, only suffering filled with pain, could constantly be watched by others, be noticed by them, sympathized by them, pitied by them!
Only through this could she relieve that deep loneliness entrenched in her heart.
After thoroughly figuring out this woman's twisted inner self, Mitsuba immediately became interested.
Excellent!
Our Twelve Kizuki needs talent like you!
As is well known, the more twisted the obsession, the more depraved the behavior, the more intricate the Blood Demon Art.
Out of curiosity about what kind of Blood Demon Art this depraved human would obtain, Mitsuba on the spot bestowed Muzan's blood upon Ubume, transforming her into a demon.
During this period, she also took some time to send that poor daughter to be raised by another family.
When Mitsuba returned, Ubume's transformation had just completed, and as expected, she awakened her Blood Demon Art.
Unlike most combat-type Blood Demon Arts, Ubume's Blood Demon Art belonged to a relatively special combination of illusion-type and space-type Blood Demon Arts.
She could use a special incense burner to release a unique fragrant smoke.
Any creature smelling this incense would be transferred into a special alternate space completely under her control.
Within this alternate space, Ubume could freely manipulate those creatures' five senses, making them experience various hallucinations.
Moreover, her main body could also leave this alternate space at any time, to avoid being killed by demon slayers trapped inside.
Additionally, because the necessary condition for trapped individuals to escape the alternate space was to break that special incense burner.
But simultaneously because this incense burner's main body was located outside the alternate space.
This led to the situation that if one fell under Ubume's Blood Demon Art without companions waiting outside to assist, for the trapped person, it was almost certainly a death sentence!
A quite sinister Blood Demon Art, very suitable for sneak attacks.
As long as you fell for it, you could basically declare death.
Even if it couldn't kill you, just being trapped inside, you could starve to death!
Truly a treasure found.
And Ubume didn't disappoint Mitsuba's expectations. In just a few short decades, she climbed to the position of Lower Rank One of the Twelve Kizuki, becoming the existence closest to Upper Rank demons in the world today.
A few years ago, because of her beautiful looks and her own strong histrionic personality, Ubume was also taken away by Doma to make movies together with Ume.
"Lower Rank demons are probably not a good idea..."
Sitting on the bench by the roadside together with Doma, Mitsuba said with a slight headache:
"Among the current Lower Ranks, even Ubume who has the most hope of being promoted to Upper Rank still has some gap compared to the weakest among us, Ume.
Their strength is too prone to failure, not suitable to serve as big villains..."
Nearly two hundred years had passed since Muzan delegated the power to manage the Twelve Kizuki to Mitsuba.
But honestly, the situation facing Lower Rank demons had not fundamentally changed from the past—they were still so disappointing, dying quickly.
Among them, only Ubume was someone Mitsuba paid relatively more attention to.
After all, she was indeed currently the most talented among all Lower Rank demons, and also the demon with the most hope of being promoted to Upper Rank.
The rest were merely there to make up numbers.
"Hmm... perhaps not necessarily?"
As if suddenly thinking of a good idea, Mitsuba snapped her fingers, excitedly saying to Doma beside her:
"Then let's choose Ubume! I have a good idea—I can just have her help me test my new ability!"
Yes, nearly two hundred years having passed, Mitsuba's Blood Demon Art had once again evolved.