Chapter Text
The mist clung thick and cold to the slopes of Mount Natagumo, tangling in the hems of Giyuu Tomioka’s haori as he stepped through the pines. The air reeked of demon rot, wisteria poison, and the faint, high hum of invisible threads strung between the trees.
He moved without haste. He already knew what he would find.
When he broke through the treeline into the clearing, Rui’s crimson strings were coiled tight around Tanjiro’s limbs, pinning him to the earth. Nezuko knelt a few paces behind, her body glowing faintly pink as she tried in vain to shield her brother. Lower Rank Five’s smirk glinted sharp and cruel, his blade raised for the killing strike.
Giyuu’s sword sang as it cleared its sheath. Water Breathing, First Form: Water Surface Slash. A single, sweeping arc sheared through every thread in his path, and severed Rui’s head clean from his shoulders before the demon could even blink.
“Return to nothing,” Giyuu said quietly, and turned his back on the remains as they began to dissolve.
Tanjiro stared up at him, blood crusted on his forehead. “You… It's you—”
A soft laugh drifted down from the canopy. “Fancy running into you here, Tomioka-san. I thought you had went on through to the other side of the forest.”
Shinobu dropped light as a butterfly from the branches, her stinger-blade already glinting violet with wisteria poison. Her gaze darted straight to Nezuko, and her smile sharpened. “And what do we have? A demon? Traveling with a Slayer? How terribly against every rule we have.”
She lunged — fast as a striking hornet, straight for Nezuko’s neck — no hesitation, no warning, pure instinct to execute the threat.
Giyuu moved faster. He stepped between them, raising his blade to deflect rather than strike; the force of the collision sent Shinobu skidding backward several feet, her feet barely brushing the moss before she twisted mid-step and landed perfectly balanced, arms spread like wings to steady herself. She didn’t look ruffled — only amused, in that sharp, knowing way of hers.
She tilted her head, sheathing her blade with a delicate click. “Oh my. That was quite the reaction. Refusing to let me carry out my duty? This sort of behaviour is exactly why people dislike you, you know.”
Giyuu said nothing. He only shifted his stance slightly, still standing firmly between her and the siblings.
Tanjiro scrambled upright, shouting frantically: “Wait! She’s not like other demons! She’s my sister — she would never hurt anyone!”
“Silence,” Shinobu said, glancing at him briefly before turning her gaze back to Giyuu, her tone light but edged. “You’re making a very dangerous choice here. I hope Master Ubuyashiki will be lenient with you when we explain.”
They brought Tanjiro and Nezuko bound, down the mountain and across the countryside, until they reached the tall, wisteria-lined gates of the Ubuyashiki estate. The air here was softer, cleaner, but the tension in the garden waiting ahead was thick enough to weigh down the air.
All nine Hashira stood assembled beneath the cherry blossom boughs: Gyomei Himejima, his prayer beads clicking softly in his large hands; Sanemi Shinazugawa, jaw set tight and scowl fixed; Obanai Iguro, eyes half-hidden behind his bandage, gaze cold and watchful; Tengen Uzui, flamboyant haori billowing slightly in the breeze; Muichiro Tokito, staring blankly at the clouds as if half-asleep; Mitsuri Kanroji, wringing her hands nervously; Kyojuro Rengoku, standing straight and bright as a burning flame; and Shinobu, who stepped neatly into line beside the others.
Tanjiro lay bound on the grass at their feet, Nezuko encased in her box just out of his reach, hidden from the sunlight. Giyuu stood apart from the rest, his expression unreadable as ever.
For a long moment no one spoke. Then the sliding doors of the main pavilion opened quietly. Two young girls — Master Ubuyashiki’s daughters — stepped out, supporting their father gently by either arm. Kagaya Ubuyashiki leaned heavily on them, his movements slow, his eyes clouded and sightless from the sickness that had plagued him all his life. When he spoke, his voice was soft, but it carried clearly across the garden.
“Thank you all for coming. Let us hear what has occurred.”
Shinobu stepped forward first, recounting the mission on Mount Natagumo, Rui’s defeat — and Giyuu’s refusal to allow Nezuko’s execution, and his choice to bring them both here instead of disposing of the threat per Corps protocol.
Sanemi’s temper snapped before she had even finished. “Are we seriously debating this?! The rules are absolute — demons eat humans! We slaughter every last one!" He whipped around towards the Water Hashira. "Tomioka — you’ve gone too far! You think you’re above the rules the rest of us risk our lives to uphold?!”
Obanai’s gaze narrowed on Giyuu. “He’s always been like this. Distant. As if he thinks he’s too good to stand wwiththe rest of us. This is exactly the sort of reckless arrogance I’ve come to expect.”
Kyojuro leaned forward slightly, his tone earnest but firm: “I understand the desire to show mercy — but this is uncharted ground! We cannot risk the safety of the entire Corps and all those we protect!”
Mitsuri looked close to tears, glancing from Giyuu to the bound (and entrapped) siblings and back again, too anxious to speak up. Muichiro just blinked, as if trying to remember what exactly they were arguing about. Gyomei said nothing, his head bowed, listening intently. Tengen nodded slowly, arms folded, waiting for more to be said.
Giyuu met their gazes one by one, and said simply: “She has not harmed anyone. And I will take responsibility for her.”
That was all — no grand speech, no long explanation, just quiet certainty. It only seemed to stoke Shinazugawa’s anger further.
“Responsibility?! What does that even mean?!” he roared, stepping forward as if he might lunge himself. “If she eats someone — if she slaughters an entire village — what then? Will your word be enough to bring them back?!”
Master Ubuyashiki raised a hand gently, and the garden fell quiet again. “I have received correspondence from former Water Hashira, Sakonji Urokodaki. Along with Giyuu Tomioka and Tanjiro Kamado, he offers this pledge: should Nezuko Kamado ever attack or consume a single human being, all three will take their own lives without hesitation.”
The red haired boy looked up at the one who had spared his younger sister only two years prior, surprised that he would risk his life to protect them after only two encounters.
A murmur rippled through the Hashira — but Sanemi was not satisfied.
“Words are wind!” he barked. “We need proof! Real proof!”
A/N: It's giving that one panel "I am the wind!" ahh
Without waiting for permission, he sliced his own forearm open with his blade, bright red blood welling instantly. He strode straight over to the box, grabbing it with his unharmed arm. He then drags it to the shade, opening the box holding the wound close to her face — his blood was rare, potent, an almost irresistible lure to demons. “Go on then! Eat! Show us exactly what you are!”
Tanjiro screamed, straining against his bonds — but Nezuko squeezed her eyes tight, turned her face firmly away, and pressed her forehead into the grass until her whole body trembled with the effort to resist. She did not snarl, did not lunge, did not so much as inhale deeply.
The silence stretched long and thin. Slowly, Sanemi lowered his arm, staring at her with a look of shock he could not quite hide.
Master Ubuyashiki smiled faintly. “We have our answer. The pledge stands. Nezuko Kamado will be permitted to remain with her brother. Should the terms be broken, the agreed penalty will be carried out.”
He turned his head slightly, as if looking directly at Giyuu through his clouded eyes. “Your judgment is given weight today, Tomioka-kun. Do not make me regret it.”
The girls guided him back inside as the Hashira began to disperse. Shinobu paused beside Giyuu for a heartbeat, her voice low enough only he could hear: “You’ve bought yourself a lot of trouble, you know. But… I suppose I’ll hold my teasing for now.”
Sanemi brushed past him with a sharp, angry huff, but he didn’t shout again. Obanai glanced back once, his expression still sour, but said nothing more. Gyomei paused for a moment, his gaze resting on Giyuu — and gave the faintest, almost imperceptible nod — before following the others away.
Giyuu stood alone in the quiet garden for a long moment, the memory of Shinobu’s blade, Nezuko’s turned face, and the weight of so many eyes fixed on him still lingering. No one asked why he had intervened so fiercely. No one wondered what lay behind his silence.
Everything was exactly as it appeared. For now.