Chapter 35: Renji Miyauchi's New Persona
To some extent, the author of that work likely borrowed from Ripple Breathing when inventing the Breathing Technique in their manga — a respectful nod to a predecessor.
Renji Miyauchi had looked into that Breathing Technique after transmigrating here, and through scattered unofficial notes and histories he'd concluded it probably existed in this world. Still, Ripple Breathing and the Breathing Technique were different in important ways.
Ripple prolonged life and grew more potent the further one advanced. The Breathing Technique's function was more focused: it strengthened cardiopulmonary function, allowed blood to load far more oxygen in a short time, and dramatically boosted physical ability during the breathing cycle. Overuse could damage the body. Its legacy, though, had produced many distinct schools — each creating sword techniques that passed down through generations, letting learners choose a style to fit their nature.
Later in that story, powerful auxiliary abilities — Mark, Scarlet Blade, and Transparent World — also appeared. Mark traded lifespan for power; Scarlet Blade centered on weapon properties; Transparent World demanded perfect, precise control of breathing and movement to reach a state where the world itself seemed transparent, letting a user perceive everything clearly.
Renji thought: if the girls could find the Breathing Technique and analyze it alongside Ripple, and if Ripple could trigger similar sword techniques, their combat potential would grow drastically.
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At home, Miko — now protective of her diary — posted to the fan group the moment she saw a new entry and then opened it.
Half a month ago she'd avoided the diary; now she found herself dependent on it. Testing at home had shown the diary invisible to the spirits that otherwise haunted her: the dead man she encountered and the foul vengeful spirit that lingered near him could not perceive the book in her hands. When she held it, the spirits seemed to hesitate, no longer probing her performance as before.
Bocchi's tactic had worked: carrying the diary could deflect attention. Miko hugged the book tight. If the diary let her survive — even if only partly — she would cling to it.
Today's entry panicked her briefly: cunning vengeful spirits that mask themselves as ordinary people were a real threat. She resolved to be cautious and save herself first. The diary's mention that powerful spirits sometimes used people with strong life energy as literal grills — roasting weaker phantoms for their own ends — made her shudder.
Still, the diary also mentioned rare countermeasures: Demon Eye Killers and the legendary Demon Slayer Corps, stoking an impossible hope. If there were descendants of that corps who preserved the Breathing Technique, maybe she could learn it and fight back — even at the cost of a shortened life. The diary suggested Ripple could perhaps be used to trigger comparable sword techniques; and Transparent World sounded like the ultimate answer: see right through a spirit's weakness.
Miko wanted to ask in the comments, but she hadn't unlocked commenting privileges yet. Instead she messaged the group.
"Miko: Has anyone heard of Garan no Dō or the Demon Slayer Corps?"
Replies rolled in — mostly blank shakes of the head.
Utaha grumbled: "The Mysterious Person's being cryptic again. One's a fugitive in the Underworld; the other's an organization from the last century — both hard to track."
Kaguya volunteered to ask Kamubo: "Even if Kamubo doesn't know the Demon Slayer Corps by name, she knew exorcists back in the day. I'll ask her. If Kamubo is ignorant, we'll leave Garan no Dō aside for now. We can't draw attention to ourselves."
Because yesterday's revelations made people more open, more of the group chimed in than before. Demon Slayer talk — Breathing Technique, Transparent World — spread excitement and speculation.
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Renji listened and nodded to himself. The details largely matched his deductions. He wasn't certain whether every named place or person existed — some might be story remnants — but the Demon Slayer Corps did have evidence in this world: a few modern references and surviving artists kept its image alive. That suggested the corps' legacy had threads that might be traced.
He'd already found one lead online: a painter named Yushiro, known for consistently drawing a single female character. In the Demon Slayer narrative, Yushiro is effectively the last "demon" figure at the story's end — proof the tale reached the present. So the corps' history probably had real echoes now.
Renji liked the idea of the girls studying Breathing Technique-style swordwork. Late-story abilities like Mark, Scarlet Blade, and especially Transparent World granted massive power. Transparent World felt like pure mental mastery; if they could even approach such a state, vengeful spirits would be toothless. With a few Nichirin-like blades that could conduct Ripple, they might leap many combat tiers — perhaps even touch grade-one curse-user territory.
That gave Renji an idea. He could craft a persona: a descendant of a rural family that once received favors from the Demon Slayer Corps, who'd preserved fragmented Breathing Technique texts. Claiming such ancestry would be a smooth cover if the Cursed Spirit Headquarters ever turned their eyes on him. He could present himself as a quietly talented genius who perfected the scattered Breathing Technique notes — a useful myth.
He could also adopt a second persona inspired by Chongyun — a Pure Yang body type from other stories — who moved to Mihana Town precisely because his constitution deterred spirits. Buying a mansion in Mihana Town would be a believable bit of lore to anchor his image if the girls took notice.
Renji smiled at the possibilities. If anyone questioned his unusual yang aura later, he'd already have a neat backstory.
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The diary's rewards had genuinely fed his mind. Real Ripple Breathing techniques — even their ancient origins and deeper history — had unlocked in his head. He had, so far, taught only introductory Ripple practices in the diary and a few useful recipes: how to sleep with Ripple, how to trigger a basic deep-sleep Ripple. Even if those girls could accelerate their practice with reading value, catching up to Renji's level remained unlikely in the near term.
That was fine. Renji planned to introduce "Silver Ripple Overdrive" — a close-combat permutation that transmits through metal — and a suite of derivative skills, thinly veiled as Breathing Technique lore. If he demonstrated splitting a boulder with a sword powered by Silver Ripple, who would suspect pure Ripple? Even experts from far older corps or Joestar-style veterans might be fooled.
Of course, if the diary ever rewarded him with something like Sun Breathing or Transparent World, his life would be made easier. With his Pure Yang Body, whether Ripple or Sun Breathing, he could wield powers beyond ordinary people. If Sun Breathing and Transparent World arrived, Renji imagined activating Mark and Transparent World cleanly — a Yoriichi-level moment.
Brimming with ideas, he pulled Jerry along to research Ripple derivatives into the night. Jerry, clever and obsessively curious, matched Renji's pace; sometimes Renji felt pressured by the little companion's insight. Pressure, however, bred motivation.
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The next day after school Renji detoured to Akihabara. Utaha's Love Metronome Volume 1 had released, and as a loyal fan he wanted copies — careful, disguised, and low-key. He chatted with a clerk about sales; the numbers were modest. In the original story Utaha's debut had rocky starts later redeemed by publicity; here Renji didn't know how her arc would play out.
Back home he ate a convenience-store bento and read her book partway through, turning over doubts in his mind. Plans for TV dramas, production costs, meme potential — all that still aligned with his long-term schemes. He'd also been cultivating local connections: Koshigaya Takeru's props, Kagayama Kaede's help, Dr. Agasa's workshop next door — a network that could be useful if he ever latched onto theatrical demon-slaying themes for a show.
When Renji visited Dr. Agasa with Takeru, the engineer and the inventor hit it off. Agasa offered mentorship to Takeru; Takeru impressed; Renji banked goodwill on both sides.
That afternoon, back at the mansion, Renji prepped his next diary entry — a careful mix of trolling and useful tips, encouraging Miko to learn Ripple first, hinting at Eye Killers and the Temple of Emptiness as distant, dangerous options, and offering patronizing but practical advice on spirits that disguise themselves as children. He kept the tone casual enough to seem harmless but useful enough that the girls might trust his notes.
Finally, after a cup of tea and one last revision, Renji put away his pen. Jerry munched contentedly. Renji lay back, one eye on the diary, the other on the odd, widening world around him — ready to play the role he'd chosen.
END of the chapter
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