The sun set, and the fiery clouds of the evening glow gradually dissipated, as a night sky like black velvet descended, covering the land.
A crow flew over the crowded city of Tokyo, landed on the edge of a railing atop a tall building, and gently preened its dark, glossy feathers.
Suddenly, it stopped, turned its head, and lowered its blood-red eyes, shifting its gaze to a small, two-story residential house.
Outside this exquisite house, which was beige in color and had a balcony, one could see through the open-framed window on the second floor a girl with eyes as clear and lively as a spring, sitting upright on a white sofa.
In front of the sofa was a clean and tidy transparent glass table, on which were only a cartoon coaster, a fruit plate containing some small oranges, and a plastic cup filled with plain water.
Through the translucent tabletop, one could see the girl wearing black stockings that revealed a hint of flesh. Her fingers, resting on her round thighs, restlessly fiddled, and her face held a trace of tension and hope.
She took a deep breath, then closed her clear, deer-like eyes, clasped her hands together, and muttered under her breath.
"Twenty meters, turn left at the intersection ahead."
"Nineteen meters... eighteen meters... seventeen meters..."
When she silently counted down to 15 meters, the girl suddenly opened her eyes and rushed out in a hurry.
She opened the door, rushed down the stairs, and went to the front door in the hallway on the first floor.
Then, she took a few deep breaths to calm her slightly breathless body, and turned the doorknob.
Creak. The beige door opened in response.
Appearing before Kimishima Kana was a tall, handsome young man with eyes as deep as an abyss, absorbing all light. He had a simple, sharp buzz cut, and his hair stood up like needles.
He was wearing a thin, tight-fitting tank top with many wet marks, indicating he had just exercised.
Through the contours of his skin pressed against the tank top, one could vaguely discern the strong physique it covered.
"Welcome home, Nii-san."
Kimishima Kana showed a big smile, then took a home shirt from the hanger beside her.
The young man nodded, neither overly enthusiastic nor completely indifferent, just lukewarm.
He took off his sweat-drenched tank top, exposing his upper body to the slightly dry and hot air.
Two pectoral muscles and a six-pack were embedded beneath his skin, looking as if they had been meticulously crafted by the finest artisan.
The phrase "ape arms, wasp waist" seemed to be specifically created for him. His physique was lean and strong, with well-defined muscle lines, yet it didn't appear bulky at all; his proportions were perfect.
It was Kurozawa.
Kimishima Kana's face turned slightly red, and she stared at Kurozawa's body without blinking, until Kurozawa put on his shirt, blocking her view.
Then, Kimishima Kana asked, "Nii-san, I just learned how to make tempura yesterday."
"Do you want to try some?"
Kurozawa glanced at Kimishima Kana, shook his head, and said flatly, "No need, I ate outside."
Kimishima Kana's face next to him dimmed slightly, but Kurozawa seemed not to notice. "I have some things to do, I'm going back to my room first."
Walking past Kimishima Kana, Kurozawa returned to his room.
The furniture in his room was very simple: a half-meter high bed, a pure white double-layer desk, a similarly white closed wardrobe, and nothing else.
Taking off his shoes, he flopped onto the bed. Kurozawa's eyes drooped, and he fell into deep thought.
Eighteen years.
After leaving the Demon Slayer World, he had been in this modern Japanese city for eighteen years.
But even now, Kurozawa had not found any familiar signs or abnormalities.
This world was like his previous life, a normal modern world without demons or monsters.
Moreover, the level of technology, cultural history, country distribution, world structure, etc., were almost exactly the same.
If it weren't for the Gray-White Panel's constant silent presence, he would have suspected that he had just had a very realistic dream and that everything was just an illusion.
"A world completely dominated by humans, with some war-torn areas, but generally peaceful."
Kurozawa leaned against the headboard, feeling a bit bored.
He had risked traversing worlds to see different sights, not to repeat past experiences.
However, there were some anomalies that Kurozawa had noticed.
The girl named Kimishima Kana was his biological sister.
Her full name was Kimishima Kana, and Kurozawa's name in this world was Kimishima Ryoma.
Due to his experiences in the Demon Slayer World, he had always maintained a clear distance from his family in this world.
No matter how close they were now, once Kurozawa decided to accumulate Power of Despair and travel to the next world, he would become a demon unwelcome in this world, hunted and killed by countries working together.
And in a sense, this modern human civilization world was far more dangerous than the Demon Slayer World.
The power of technology should never be underestimated.
Being betrayed and abandoned by loved ones was the easiest price to pay.
If he invested too much emotion, it would be even harder to let go in the future.
Kurozawa, who had suffered losses because of this last time, did not intend to repeat the same mistake.
From the start, he had built a psychological defense for himself, treating himself as a traveler and observer, watching with cold detachment.
His wealthy parents, who were always on business trips, didn't seem to mind. They likely viewed Kurozawa's aloofness as typical teenage rebellion and didn't react much.
But his younger sister, Kana, was a little off.
No.
She was very off.
No matter how cold Kurozawa was towards her, she was always enthusiastically trying to build a connection with him.
Kana had some kind of perceptive ability and would often sense Kurozawa, using his location and activities to engineer various "chance" encounters and "accidents."
But Kurozawa saw right through it all, watching it unfold.
Kana's perceptive ability had once led Kurozawa to believe that perhaps there were hidden superhumans in this world, and he had even actively searched for a while.
Unfortunately, he found nothing.
Furthermore, Kana's perceptive ability was pitifully weak. It could be described as a heightened sixth sense or intuition, not a true sensory ability usable for seeking out enemies.
Kurozawa had played some tricks to test Kana's sensing ability.
Then he was astonished to discover that Kana could only sense him.
In a vast crowd, within a hundred-meter radius, she could vaguely sense Kurozawa's presence whether her eyes were open or closed, yet she felt nothing towards anyone or anything else.
Perhaps it was this unique connection that caused Kana to have illusions and subsequently develop some inappropriate feelings for Kurozawa.
Kurozawa had unintentionally seen some manga collections Kana had bought.
Kiss My Brother
It's Okay to Be with My Brother as Long as There's Love
The Secret Relationship Between Me and My Brother
Kurozawa was utterly speechless about this.
Putting thoughts of Kana aside, Kurozawa took a deep breath.
Visible streams of air condensed, surging towards his nose and mouth.
At the same time, as Kurozawa breathed rhythmically, the bright full moon outside the window seemed to project rays of moonlight, entering the room and then flowing into Kurozawa's heart and lungs, subtly strengthening his physique.
This was Kokushibo's Moon Breathing.
Each Breathing Technique required a matching physique and talent to cultivate.
Kurozawa had tried all the Breathing Techniques in the Demon Slayer World and found that the one most compatible with this body was not one of the five main Breathing Techniques, but Moon Breathing.
This was very good news.
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