𝓓𝓮𝓶𝓸𝓷 𝓢𝓵𝓪𝔂𝓮𝓻: 𝓢𝓱𝓪𝓭𝓸𝔀’𝓼 𝓛𝓪𝓼𝓽 𝓑𝓻𝓮𝓪𝓽𝓱
𝓨/𝓝, 𝓽𝓱𝓮 𝓢𝓱𝓪𝓭𝓸𝔀 𝓗𝓪𝓼𝓱𝓲𝓻𝓪, 𝓯𝓲𝓰𝓱𝓽𝓼 𝓪𝓵𝓸𝓷𝓰𝓼𝓲𝓭𝓮 𝓢𝓪𝓷𝓮𝓶𝓲, 𝓖𝔂𝓸𝓶𝓮𝓲, 𝓜𝓾𝓲𝓬𝓱𝓲𝓻𝓸, 𝓪𝓷𝓭 𝓖𝓮𝓷𝔂𝓪 𝓭𝓾𝓻𝓲𝓷𝓰 𝓽𝓱𝓮 𝓯𝓲𝓷𝓪𝓵 𝓫𝓪𝓽𝓽𝓵𝓮 𝓲𝓷 𝓽𝓱𝓮 𝓘𝓷𝓯𝓲𝓷𝓲𝓽𝔂 𝓒𝓪𝓼𝓽𝓵𝓮. 𝓒𝓸𝓵𝓭, 𝓬𝓪𝓵𝓬𝓾𝓵𝓪𝓽𝓲𝓷𝓰, 𝓪𝓷𝓭 𝓼𝓮𝓬𝓻𝓮𝓽𝓵𝔂 𝓵𝓸𝓿𝓲𝓷𝓰, 𝓱𝓮 𝓯𝓪𝓬𝓮𝓼 𝓚𝓸𝓴𝓾𝓼𝓱𝓲𝓫𝓸 𝓽𝓸 𝓹𝓻𝓸𝓽𝓮𝓬𝓽 𝓱𝓲𝓼 𝓬𝓸𝓶𝓻𝓪𝓭𝓮𝓼, 𝓾𝓵𝓽𝓲𝓶𝓪𝓽𝓮𝓵𝔂 𝓼𝓪𝓬𝓻𝓲𝓯𝓲𝓬𝓲𝓷𝓰 𝓱𝓲𝓶𝓼𝓮𝓵𝓯 𝓪𝓷𝓭 𝓵𝓮𝓪𝓿𝓲𝓷𝓰 𝓢𝓪𝓷𝓮𝓶𝓲 𝓽𝓸 𝓰𝓻𝓪𝓹𝓹𝓵𝓮 𝔀𝓲𝓽𝓱 𝓽𝓱𝓮 𝓵𝓸𝓼𝓼 𝓸𝓯 𝓽𝓱𝓮 𝓸𝓷𝓮 𝓱𝓮 𝓽𝓻𝓾𝓵𝔂 𝓵𝓸𝓿𝓮𝓼.
𝓐𝓶𝓲𝓭𝓼𝓽 𝓽𝓱𝓮 𝓬𝓱𝓪𝓸𝓼 𝓸𝓯 𝓽𝓱𝓮 𝓘𝓷𝓯𝓲𝓷𝓲𝓽𝔂 𝓒𝓪𝓼𝓽𝓵𝓮, 𝓨/𝓝, 𝓽𝓱𝓮 𝓮𝓷𝓲𝓰𝓶𝓪𝓽𝓲𝓬 𝓢𝓱𝓪𝓭𝓸𝔀 𝓗𝓪𝓼𝓱𝓲𝓻𝓪, 𝓶𝓸𝓿𝓮𝓼 𝓵𝓲𝓴𝓮 𝓪 𝓹𝓱𝓪𝓷𝓽𝓸𝓶 𝓪𝓬𝓻𝓸𝓼𝓼 𝓽𝓱𝓮 𝓫𝓪𝓽𝓽𝓵𝓮𝓯𝓲𝓮𝓵𝓭. 𝓐𝓽 𝓽𝔀𝓮𝓷𝓽𝔂-𝓸𝓷𝓮, 𝓱𝓮 𝓲𝓼 𝓯𝓮𝓪𝓻𝓮𝓭 𝓯𝓸𝓻 𝓱𝓲𝓼 𝓬𝓸𝓵𝓭, 𝓬𝓪𝓵𝓬𝓾𝓵𝓪𝓽𝓲𝓷𝓰 𝓶𝓲𝓷𝓭 𝓪𝓷𝓭 𝓵𝓮𝓽𝓱𝓪𝓵 𝓢𝓱𝓪𝓭𝓸𝔀 𝓑𝓻𝓮𝓪𝓽𝓱𝓲𝓷𝓰 𝓽𝓮𝓬𝓱𝓷𝓲𝓺𝓾𝓮𝓼, 𝔂𝓮𝓽 𝓫𝓮𝓱𝓲𝓷𝓭 𝓱𝓲𝓼 𝓶𝓪𝓭𝓷𝓮𝓼𝓼 𝓵𝓲𝓮𝓼 𝓪 𝓭𝓮𝓮𝓹 𝓵𝓸𝓿𝓮 𝓯𝓸𝓻 𝓱𝓲𝓼 𝓬𝓸𝓶𝓻𝓪𝓭𝓮𝓼 𝓪𝓷𝓭 𝓪 𝓹𝓪𝓻𝓪𝓵𝔂𝔃𝓲𝓷𝓰 𝓯𝓮𝓪𝓻 𝓸𝓯 𝓭𝓮𝓪𝓽𝓱. 𝓦𝓱𝓮𝓷 𝓚𝓸𝓴𝓾𝓼𝓱𝓲𝓫𝓸 𝓭𝓮𝓼𝓬𝓮𝓷𝓭𝓼 𝓾𝓹𝓸𝓷 𝓽𝓱𝓮 𝓬𝓸𝓻𝓹𝓼, 𝓨/𝓝 𝓯𝓲𝓰𝓱𝓽𝓼 𝔀𝓲𝓽𝓱 𝓼𝓾𝓻𝓰𝓲𝓬𝓪𝓵 𝓹𝓻𝓮𝓬𝓲𝓼𝓲𝓸𝓷, 𝓾𝓼𝓲𝓷𝓰 𝓮𝓿𝓮𝓻𝔂 𝓯𝓸𝓻𝓶 𝓸𝓯 𝓢𝓱𝓪𝓭𝓸𝔀 𝓑𝓻𝓮𝓪𝓽𝓱𝓲𝓷𝓰 𝓽𝓸 𝓹𝓻𝓸𝓽𝓮𝓬𝓽 𝓜𝓾𝓲𝓬𝓱𝓲𝓻𝓸 𝓪𝓷𝓭 𝓖𝓮𝓷𝔂𝓪. 𝓓𝓮𝓼𝓹𝓲𝓽𝓮 𝓱𝓲𝓼 𝓫𝓻𝓲𝓵𝓵𝓲𝓪𝓷𝓬𝓮, 𝓯𝓪𝓽𝓮 𝓲𝓷𝓽𝓮𝓻𝓿𝓮𝓷𝓮𝓼, 𝓪𝓷𝓭 𝓨/𝓝 𝓯𝓪𝓵𝓵𝓼, 𝓶𝓸𝓻𝓽𝓪𝓵𝓵𝔂 𝔀𝓸𝓾𝓷𝓭𝓮𝓭, 𝓲𝓷 𝓢𝓪𝓷𝓮𝓶𝓲’𝓼 𝓪𝓻𝓶𝓼. 𝓣𝓱𝓮 𝓫𝓻𝓪𝓼𝓱 𝓪𝓷𝓭 𝓽𝓼𝓾𝓷𝓭𝓮𝓻𝓮 𝓦𝓲𝓷𝓭 𝓗𝓪𝓼𝓱𝓲𝓻𝓪 𝓼𝓽𝓻𝓾𝓰𝓰𝓵𝓮𝓼 𝓽𝓸 𝓻𝓮𝓬𝓸𝓷𝓬𝓲𝓵𝓮 𝓱𝓲𝓼 𝓰𝓻𝓲𝓮𝓯 𝔀𝓲𝓽𝓱 𝓽𝓱𝓮 𝓾𝓷𝓼𝓹𝓸𝓴𝓮𝓷 𝓵𝓸𝓿𝓮 𝓱𝓮 𝓱𝓪𝓼 𝓪𝓵𝔀𝓪𝔂𝓼 𝓱𝓲𝓭𝓭𝓮𝓷. 𝓐𝓼 𝓽𝓱𝓮 𝓭𝓾𝓼𝓽 𝓸𝓯 𝓫𝓪𝓽𝓽𝓵𝓮 𝓼𝓮𝓽𝓽𝓵𝓮𝓼, 𝓽𝓱𝓮 𝓼𝓱𝓪𝓭𝓸𝔀𝓼 𝓸𝓯 𝓨/𝓝’𝓼 𝓼𝓪𝓬𝓻𝓲𝓯𝓲𝓬𝓮 𝓵𝓲𝓷𝓰𝓮𝓻, 𝓵𝓮𝓪𝓿𝓲𝓷𝓰 𝓪 𝓶𝓪𝓻𝓴 𝓸𝓷 𝓽𝓱𝓸𝓼𝓮 𝔀𝓱𝓸 𝓼𝓾𝓻𝓿𝓲𝓿𝓮 𝓪𝓷𝓭 𝓪 𝓹𝓻𝓸𝓶𝓲𝓼𝓮 𝓽𝓱𝓪𝓽 𝓱𝓲𝓼 𝓶𝓮𝓶𝓸𝓻𝔂 𝔀𝓲𝓵𝓵 𝓷𝓸𝓽 𝓯𝓪𝓭𝓮.
𝓖𝓻𝓪𝓹𝓱𝓲𝓬 𝓥𝓲𝓸𝓵𝓮𝓷𝓬𝓮 & 𝓑𝓵𝓸𝓸𝓭: 𝓓𝓮𝓹𝓲𝓬𝓽𝓲𝓸𝓷𝓼 𝓸𝓯 𝓫𝓪𝓽𝓽𝓵𝓮 𝔀𝓸𝓾𝓷𝓭𝓼, 𝓯𝓲𝓰𝓱𝓽𝓲𝓷𝓰 𝔀𝓲𝓽𝓱 𝓭𝓮𝓶𝓸𝓷𝓼, 𝓪𝓷𝓭 𝓯𝓪𝓽𝓪𝓵 𝓲𝓷𝓳𝓾𝓻𝓲𝓮𝓼.
𝓓𝓮𝓪𝓽𝓱 / 𝓒𝓱𝓪𝓻𝓪𝓬𝓽𝓮𝓻 𝓓𝓮𝓪𝓽𝓱: 𝓜𝓪𝓳𝓸𝓻 𝓬𝓱𝓪𝓻𝓪𝓬𝓽𝓮𝓻 (𝓨/𝓝) 𝓭𝓲𝓮𝓼 𝓭𝓾𝓻𝓲𝓷𝓰 𝓽𝓱𝓮 𝓘𝓷𝓯𝓲𝓷𝓲𝓽𝔂 𝓒𝓪𝓼𝓽𝓵𝓮 𝓫𝓪𝓽𝓽𝓵𝓮.
𝓔𝓶𝓸𝓽𝓲𝓸𝓷𝓪𝓵 𝓣𝓻𝓪𝓾𝓶𝓪 / 𝓖𝓻𝓲𝓮𝓯: 𝓘𝓷𝓽𝓮𝓷𝓼𝓮 𝓹𝓸𝓻𝓽𝓻𝓪𝔂𝓪𝓵 𝓸𝓯 𝓢𝓪𝓷𝓮𝓶𝓲 𝓪𝓷𝓭 𝓸𝓽𝓱𝓮𝓻 𝓗𝓪𝓼𝓱𝓲𝓻𝓪 𝓬𝓸𝓹𝓲𝓷𝓰 𝔀𝓲𝓽𝓱 𝓵𝓸𝓼𝓼 𝓪𝓷𝓭 𝓰𝓾𝓲𝓵𝓽.
𝓟𝓼𝔂𝓬𝓱𝓸𝓵𝓸𝓰𝓲𝓬𝓪𝓵 𝓢𝓽𝓻𝓾𝓰𝓰𝓵𝓮: 𝓨/𝓝’𝓼 𝓯𝓮𝓪𝓻 𝓸𝓯 𝓭𝓮𝓪𝓽𝓱, 𝓲𝓷𝓷𝓮𝓻 𝓶𝓪𝓭𝓷𝓮𝓼𝓼, 𝓪𝓷𝓭 𝓶𝓮𝓷𝓽𝓪𝓵 𝓽𝓮𝓷𝓼𝓲𝓸𝓷 𝓾𝓷𝓭𝓮𝓻 𝓵𝓲𝓯𝓮-𝓽𝓱𝓻𝓮𝓪𝓽𝓮𝓷𝓲𝓷𝓰 𝓼𝓲𝓽𝓾𝓪𝓽𝓲𝓸𝓷𝓼.
𝓢𝓽𝓻𝓸𝓷𝓰 𝓛𝓪𝓷𝓰𝓾𝓪𝓰𝓮 / 𝓣𝓼𝓾𝓷𝓭𝓮𝓻𝓮 𝓑𝓮𝓱𝓪𝓿𝓲𝓸𝓻: 𝓗𝓪𝓻𝓼𝓱 𝓼𝓹𝓮𝓮𝓬𝓱 𝓪𝓷𝓭 𝓪𝓰𝓰𝓻𝓮𝓼𝓼𝓲𝓿𝓮 𝓲𝓷𝓽𝓮𝓻𝓪𝓬𝓽𝓲𝓸𝓷𝓼 𝓬𝓸𝓷𝓼𝓲𝓼𝓽𝓮𝓷𝓽 𝔀𝓲𝓽𝓱 𝓢𝓪𝓷𝓮𝓶𝓲’𝓼 𝓹𝓮𝓻𝓼𝓸𝓷𝓪𝓵𝓲𝓽𝔂.
The air in the Infinity Castle shimmered with a deadly stillness, the remnants of battle echoing through the shattered halls. Shadows clung to every wall and pillar, bending unnaturally in the flickering light of dying torches. Y/N, the Shadow Hashira, moved with a precision that was almost unnatural, every step deliberate, calculated, yet haunted. His breath was steady, even as the oppressive presence of Kokushibo loomed above the battlefield, the Upper Moon One’s gaze sweeping across the Demon Slayer Corps like a predator surveying prey.
Sanemi’s voice cut through the chaos, sharp and irritable as ever. “Move it, damn it! Don’t just stand there!” His eyes flicked to Y/N with that familiar mixture of worry and irritation, the tsundere edge he always carried around those he cared about.
“I am moving,” Y/N replied coldly, his voice a low rumble, as he darted toward Muichiro, who was struggling to fend off Kokushibo’s relentless strikes. “Stay back, I can cover him.”
Y/N’s hands gripped his sword tightly. His Shadow Breathing flowed through him, a dance of darkness that seemed to make the very air bend.
First Form: Veil of the Moonless Abyss
He lunged forward, his blade a black streak in the dim light, slicing through the air with a sound that almost whispered. Kokushibo’s attack met him, a clash of steel and intent, sparks flying, but Y/N’s cold calculation allowed him to twist just enough, parrying with minimal movement.
“Damn it!” Sanemi growled, dashing beside him. “Stop hesitating, move!”
Y/N’s lips twitched in something like a smile, hidden beneath the shadows that curled around his form. He hated this — the fear gnawing at him from inside. The thought that he might die terrified him, but the faces of Muichiro and Genya burned in his mind. He would not let them fall.
Second Form: Phantom Eclipse
He swept his blade in a horizontal arc, the shadows trailing like ribbons behind him, lashing out and cutting through Kokushibo’s layered defenses. The demon’s eyes narrowed, recognizing the subtlety, the deadly precision that few could match.
“You think that will stop me?” Kokushibo’s voice was a rasp, filled with disdain. “You are nothing but a shadow playing at light.”
Y/N’s reply was calm, almost detached. “Shadows can consume light, if they are patient enough.”
Sanemi’s eyes softened for the briefest moment, though his voice remained sharp. “You talk too much, damn it! Just survive!”
But Y/N did not move recklessly. He danced around Kokushibo’s blade, each step measured. His Third Form: Abyssal Crescent cut with elegance, striking at Kokushibo’s flank, forcing the Upper Moon to stagger just slightly. Muichiro took the opening, slashing with a clarity and grace that Y/N admired silently, while Genya’s roar echoed as he charged, shoving Kokushibo back.
It was not enough. Kokushibo’s counterattack was merciless. The Upper Moon’s blade slashed through the air, moving faster than the eye could follow. Y/N’s body moved instinctively to protect the younger Hashira, taking the brunt of the strike. Pain erupted, hot and consuming, and he stumbled, blood blooming across his chest.
Sanemi’s scream tore through the hall. “Y/N!” He lunged forward, trying to shield him, but Kokushibo’s presence was overwhelming, forcing even Sanemi to falter.
Y/N’s hands found Sanemi’s as he fell to one knee. His breath came in shallow gasps, the shadow around him dimming like a candle about to die. “Sanemi…” His voice was quiet, almost tender. “I… I am not going to… leave… them… or you…”
“You idiot! Don’t you dare die on me!” Sanemi’s hands shook as he gripped Y/N’s shoulders. His usual harsh words broke into choked sobs. “Stay with me, you damn idiot! Stay alive!”
Y/N managed a small, crooked smile. “I… I can’t… not this time… Muichiro… Genya…” His eyes flickered toward them, alive and fighting, even as his own strength failed.
Fourth Form: Umbral Requiem
In a final act of precision, Y/N struck at Kokushibo’s advancing attack, deflecting it long enough for Muichiro to regain his footing and Genya to land a decisive blow. The Upper Moon recoiled, his rage palpable, but Y/N’s body could no longer respond. He collapsed against the cold stone floor.
Sanemi fell beside him, ignoring his own injuries. “Don’t look at me like that,” he whispered, voice trembling. “You idiot… don’t leave me like this…”
Y/N’s hand weakly traced the line of Sanemi’s cheek. “I… love… you,” he murmured. His eyes began to close. “Be… strong… for them… and… for yourself…”
Tears streaked Sanemi’s face, mixing with the dirt and blood. “I hate you… damn it… don’t say that! Stay! Stay with me!”
But Y/N’s breath slowed, his body growing still. Sanemi pressed his forehead against Y/N’s, words failing him as the realization hit fully. The Shadow Hashira he had argued with, worried about, and loved with all his heart was gone.
The battlefield seemed to quiet around them for a moment. Muichiro and Genya, barely noticing the exchange amidst their fight, stole glances at the fallen Hashira, recognizing the sacrifice without words. Even Kokushibo, now retreating, sensed the shift in the tides, a momentary pause in the chaos.
Sanemi refused to release him. “I… I’ll kill him… I’ll kill him for you!” he growled, his voice raw, shaking with grief and fury. But he knew, deep down, that nothing he could do would bring Y/N back. He pressed a trembling hand over Y/N’s chest, feeling the absence of the life that had burned so fiercely.
Gyomei, approaching after securing the battlefield, knelt beside Sanemi. His deep, resonant voice broke the silence. “Sanemi… he gave his life for the others. That is honor… and love. You must carry that with you.”
Sanemi’s lips quivered. “I don’t want honor… I just…” His fingers curled around Y/N’s sword, still warm, still a symbol of the man who had been both maddening and tender in ways no one else could understand. “…I just wanted him to survive.”
The hall echoed with the cries of the wounded and the dying, but for Sanemi, time had slowed. His Shadow Hashira was gone, yet the memory of his precise, lethal movements, his cold but loving demeanor, and the terror he had masked behind calm calculation burned vividly in his mind.
He pressed his forehead again to Y/N’s, whispering promises that he knew he could not keep, but needed to say. “I’ll… protect them… for you. I’ll… survive… because you loved me. You stupid, stubborn, impossible man…”
Muichiro and Genya, catching their breath after the fight, slowly approached. Muichiro’s voice was soft, almost reverent. “He saved us… all of us.” Genya, still trembling, nodded fiercely, his eyes red. “We won’t forget him… ever.”
Sanemi did not respond. He simply stayed there, holding Y/N’s body, a storm of grief and love and rage and helplessness coursing through him. For the first time, he allowed himself to be completely unguarded, the tsundere mask falling away to reveal the raw, aching heart beneath.
And though Y/N’s shadow had left this world, Sanemi could feel it in the stillness of the Infinity Castle, in the echoes of battle, and in the memory of every precise, deadly movement that had been uniquely his.
