The money Rei had spent years building had found its clearest purpose in giving him the freedom to promote his work however he judged necessary, without needing to weigh the costs against others' opinions or comfort.
Television commercials across multiple networks. Large-format posters in prominent locations across every major city in the country.
The industry watched all of this and could not make the logic add up.
Even during the peak runs of Hunter x Hunter, One-Punch Man, and Arcane, Rei had not pushed promotional resources at this intensity.
And those had been works whose performance justified extraordinary confidence from the first episode. Demon Slayer had spent five months being contested. A slight upward trend in the ratings did not obviously explain what was happening now.
But this was, in Rei's assessment, precisely what the situation required.
He understood clearly that Demon Slayer had been a global phenomenon in his previous life. He also understood that the specific cultural and social conditions that had shaped that explosion could not be transplanted directly.
Every era produced its own context. Neon Genesis Evangelion was a classic by any standard, but its particular resonance in Japan had been inseparable from the specific anxieties of the bubble economy period in which it arrived. Remove that context and the work was still exceptional. The depth of its cultural impact would have been different.
Japan could not replicate the conditions of Demon Slayer's previous-life success exactly. What Rei could do was use his current reach and his promotional budget to get as many eyes on the work as possible at the moment when the work was about to give those eyes something worth seeing.
Get the fire started. The sparks would do the rest.
Thursday arrived.
Between the recent upward movement in the ratings, the tankōbon release, and the sustained promotional campaign of the past several weeks, the fan communities and online forums were already active well before the broadcast window.
"Finally Thursday again. It has not been easy getting here."
"I have been following Shirogane-sensei's work since my first year of high school, starting with Hikaru no Go. I am almost at university now. Every single work, on time. These past few weeks have been the first time I have felt like the anti-fan presence was actually losing ground."
"Anime works are judged by results. The Demon Slayer tankōbon released last week. The exact first-week sales figures have not been confirmed yet but by Saturday it is looking very likely the volume will have cleared six million copies. Numbers like that do not leave much room for the anti-fan argument to stand on."
"Honestly, from the beginning, both the manga and the anime have been performing well by any normal standard. The only thing they could not do was match Hunter x Hunter directly. Now that the story has expanded and the world-building has settled, the bounce-back was always going to happen."
"My friends and I have already decided we are going to the July film regardless of anything else. The box office for that movie should clear at least double what the Five Centimeters Per Second live-action film achieved."
Natsuki Endo pulled her attention away from Shirogane's account page.
Three minutes ago he had posted a new update.
"Tonight, let's welcome the Hinokami."
Natsuki stared at it.
Hino... Hinokami?
She had no immediate frame of reference for the word. Whatever it meant, the post clearly connected to tonight's episode. She checked the time. Ten minutes until the episode nineteen broadcast.
She replied to a few critics who were still posting in Shirogane's comment section, then shared the update across the fan groups she was part of, then went downstairs to collect the delivery order she had placed earlier.
As an office worker she had turned down a dinner with close friends specifically to be home for this broadcast. She stood in the entrance hall with her food and took a slow breath.
Shirogane had not said anything specific. But the promotional intensity of the past week had been unlike anything surrounding this series before, and the update he had just posted was the first time he had ever broken his usual silence about an individual episode in advance.
Tonight's episode was significant. She could feel the shape of that fact without knowing its contents.
Please don't let me down.
Eight o'clock arrived. The Ion TV screen cut to the familiar opening sequence of Demon Slayer: Kimetsu no Yaiba.
Natsuki did not skip the opening. She never did. She watched it through to the end with full attention, then followed the story as it picked up from where the previous week had left off.
Inosuke, saved by Giyu. The energy between these two characters, a loud and physically reckless young man colliding with a person of almost perfect emotional stillness, produced the kind of comedy the series had learned to generate without interrupting its own tone. Their brief exchange was exactly this.
And within it, Giyu delivered information that the audience had been waiting to receive.
The father of the spider family was not a member of the Twelve Kizuki.
The scene shifted to Shinobu Kocho working to counter the spider venom progressing through Zenitsu's system.
Natsuki's attention, though, was on Tanjiro.
The episode returned to him quickly.
Rui cut Tanjiro's blade with a single application of his spider threads. The sword came apart cleanly, and Rui's expression as he watched this happen carried nothing in particular. No satisfaction. Just a conclusion he had expected.
"How about it? Are you still not prepared to take back what you said?"
Tanjiro had told Rui that the bond between him and his family was a false one. Rui had no interest in revising his position on that. Since Tanjiro was equally unwilling to revise his, Rui moved to finish it.
Spider threads came from every direction simultaneously, fine enough to cut through almost anything, moving faster than the eye could comfortably follow.
The visual composition of the sequence stopped Natsuki momentarily. The series had been doing this throughout the Natagumo Mountain arc, treating its action sequences as something closer to moving illustration than conventional animation. Each frame held.
Tanjiro could not clear all of the threads.
At the moment it mattered, the figure standing in front of him was Nezuko.
She could not speak. She had not been able to speak since her transformation. She stood in front of her brother and absorbed what was coming for him anyway.
Her injuries would heal. The regeneration was a property of what she had become. But Natsuki knew, watching it, that the pain of each wound was fully real in the moment it arrived.
"You... that woman... are you siblings?"
Rui's voice had changed. The flatness was gone. His finger, pointing at Nezuko, was not entirely steady.
"What if we are?"
Tanjiro's voice cracked on it. His eyes were wet. He took Nezuko's wrist, which was connected to her arm by almost nothing, and held it back into place by force of will as much as anything else.
Natsuki's anger was immediate and physical. She felt it before she had fully processed what she was seeing.
And then Rui's expression, as he watched the two of them shield each other from what should have been fatal, became something Natsuki had not expected from this particular character.
"This is a real bond. I want it so much."
Natsuki's mouth opened.
She closed it.
Opened it again.
This demon, she thought. This is genuinely the most pathetic thing I have ever watched on television.
He had spent the entire arc telling Tanjiro that the bond between him and Nezuko was false and hollow. He had constructed an artificial family around himself through coercion and fear and called it connection.
And now, watching two actual siblings absorb wounds for each other without calculation or hesitation, he was standing there with grief on his face because he wanted what he had spent the arc dismissing.
The concentrated sourness of the moment was remarkable.
Beside Rui, the demon he called his sister had heard his words. She turned to him.
"I am your sister. Please don't abandon me."
Natsuki could not hold the noise in any longer.
What kind of family dynamic was this supposed to be?
Before Natsuki could finish laughing, Rui raised his hand and cut his sister into pieces with his spider threads in a single casual motion.
The body reassembled itself. The sister got up and ran away crying.
Natsuki sat there with her mouth open.
Tanjiro on screen looked equally incapable of processing what he had just witnessed.
"After seeing your bond, my body is trembling. I am deeply moved."
Rui's tone carried nothing contradictory about this statement. He continued.
"But you can only be killed by me. That would be such a waste. However, there is one way to avoid it. Give me your sister. Let her become my sister. Then I will spare your life."
Tanjiro refused.
"After I kill you, I will create a bond. A bond of terror. I will let her understand what the consequences are for defying her older brother."
The episode's tone shifted.
Natsuki felt her breathing change slightly. The anger had moved past the comedic register of the previous scene and into something heavier.