Perception is a metaphysical thing, the body's sensation of its surroundings.
It can be sight, hearing, touch, and so on.
As the Breathing Technique becomes more precise, the body's development can reach an incredible level.
It becomes possible to control one's body more accurately and amplify bodily perceptions with ease.
Of course, perception also involves natural talent.
Tanjirou's sense of smell, Zenitsu's hearing, Inosuke's touch, Kanao's sight, and Genya's taste are all innate talents that cannot be trained in the Late Stage.
Therefore, Mizuki cannot compare with them in their respective gifted Domains.
But after Tamayo's modifications, her perception abilities improved significantly, regardless of the precision of her Breathing Technique; it was like an elevation of her life essence.
She became what Tamayo called the second true 'demon' after Muzan.
Her diffused perception seemed to form an unobservable circular Qi field that spread out, quickly enveloping the Ubuyashiki mansion.
It's no exaggeration to say that even though she was lying in bed, the situation of the Ubuyashiki mansion was fully present within her perception.
Even the Ubuyashiki couple, whispering next door, were no exception. Through her perception of air currents, Mizuki could determine their location, and her powerful hearing could pick up what they were saying... Mizuki's old face flushed, and she quickly diverted her perception, spreading it in other directions... Very good, a quiet and peaceful night.
Mizuki closed her eyes peacefully.
The steady breathing beside her fluctuated, making Mizuki feel that the children beside her truly belonged to the human realm... Mizuki clutched the blanket tightly.
It's still a bit scary... Suddenly, Mizuki abruptly sat up.
Her movements did not wake the sleeping children. Watching them still sound asleep, the next moment, Mizuki's figure vanished from the room.
Outside, Mizuki's figure flickered a few times, and she had already crossed the yard and arrived at the corner of the outer wall.
One after another, strange and ugly Eyeball Monsters were moving rapidly using their tentacle-like limbs, scattering in all directions.
One team was heading towards the Ubuyashiki mansion.
Mizuki hid in the shadow of the wall corner, silently watching this scene.
It was faster than she expected.
Last night, she had specifically observed the movements of these Eyeball Monsters; they were exploring in the opposite direction from the Ubuyashiki mansion.
But today, they suddenly appeared in the completely opposite direction.
These Eyeball Monsters moved very quickly, and their ability to conceal their presence was excellent. Unless seen with one's own eyes, even a Hashira would find it difficult to sense them.
It was only because she had'super evolved' now; in the past, she might not have been able to detect them from so far away.
After all, perception was not her strong suit.
Seeing the Eyeball Monsters about to squeeze through the door crack into the Ubuyashiki mansion, Mizuki hesitated for a moment, then flashed away.
Inside the Infinity Castle.
"Muzan-sama, another mansion has been marked," Nakime's voice calmly rang out.
Muzan followed her vision, and a serene mansion appeared in his line of sight.
Through Nakime's perspective, his perception was greatly weakened, making it impossible to effectively sense the specific situation inside the mansion.
But it didn't matter; these Eyeball Monsters would explore the entire mansion, not missing a single ant.
Since he learned the general location of the Ubuyashiki mansion last night, Muzan was in a rather good mood at this moment.
There were many buildings nearby; perhaps one of them was Ubuyashiki's hiding place.
"Very good, continue exploring," Muzan commanded in a very good mood, already intending to withdraw his gaze.
Suddenly, as the Eyeball Monster walked down the corridor, rounded a corner, and prepared to investigate the general situation inside the rooms, a straight figure stood in the hallway.
A human?
At this distance?
Kibutsuji Muzan's eyes narrowed slightly. Nakime's Blood Demon Art, while her pure perception ability wasn't strong, it shouldn't be so weak that she couldn't detect someone just around a corner.
This method of concealing one's presence, was it a Hashira?
Nakime also seemed to realize this, her hand pausing on the biwa, and the Eyeball Monster moved upwards from its low perspective.
Muzan's expression also became a bit more focused.
Who is it?
To possess such an ability.
The Ubuyashiki mansion hadn't been fully explored yet, and this would inevitably arouse their vigilance.
But as Nakime's perspective quickly rose, Muzan's thoughts abruptly ceased.
The weather tonight was good, or rather, in this era, an era where the atmosphere had not yet been severely polluted, on a night with good weather, the moonlight was as bright as day.
The pure, cold moonlight spilled down onto the eaves, and after sweeping past the shadows of the feet and legs, the figure dressed in simple black training attire came into Muzan's eyes.
Crimson long hair contrasted sharply with the silver-white moonlight. Without needing excessive details, just a silhouette created a powerful visual impact, shaking Muzan's memories.
That monster... Kibutsuji Muzan didn't even notice the ample bosom in front of the figure; merely the similar appearance made him recall his past painful memories.
Burning pain seemed to erupt throughout his body.
Nakime felt the same way as him.
The stronger a demon, the more muzan cells they possess. It's basically impossible to become stronger purely by eating humans.
Compared to eating humans, a small favor from Muzan is enough to allow a weak demon to grow into one of the Twelve Demon Moons.
Simply put, it depends on luck.
Those with good luck include the former lower rank five, Rui, who gained Muzan's favor simply by having similar experiences to him.
Nakime was no exception; her unique Blood Demon Art made her Muzan's confidante.
This single technique of the Infinity Castle, a different dimension, was enough to make a monster like Yoriichi rage impotently on the ground.
Nakime, who had absorbed a large number of muzan cells, also involuntarily conjured the image of that monster in her mind when she saw this scene.
Unlike Muzan, who suffered from Yoriichi-phobia, Nakime quickly calmed down.
Knowing full well this was her boss's dark history, she decisively chose to ignore it and calmly reminded him: "Muzan-sama, the target has been found."
Nakime's calm voice brought Muzan back to his senses.
Kibutsuji Muzan's wine-red eyes narrowed to pinpricks, and he gasped for air, cold sweat even appearing on his forehead.
He had long known of this woman's existence and appearance, and even his purpose was to devour her.
But suddenly, he couldn't help but recall that monster.
It was like watching a horror movie and having a ghost suddenly appear right in your face when you're completely unprepared.
Even if you already know it's a horror movie.
Fortunately, after Kokushibou became a demon, he looked nothing like that monster, otherwise, he might have to consider finding a new partner.
Muzan's breathing gradually calmed. He tore open the front of his clothes; that momentary fright had actually made him sweat.
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