Suddenly, the entire Infinity Castle began to shake and deform. "Yaaah! This pressure is crushing me! But I have to attack, Muzan is right there!" exclaimed Mitsuri. Goku saw his eyepatch falling away. (I lost my eyepatch... That was the last memory I had of Genya...) he thought. Back then, after the fight with Hantengu was over, Goku had lost his eyepatch. The day after, when Genya was at the Butterfly Mansion, he gave Goku a new eyepatch. But now, it got lost. That eyepatch was very, very important to Goku. But now, it got lost. (And here's another important thing to me that slips away...)
"Listen to me, Kanroji," said Yushiro. "I'll handle the biwa demon, you'll serve as a bait. I'll sneak up on her, invade her mind and free her from Muzan's control."
"Can you really do it? That's fantastic!" said Mitsuri. Suddenly, the castle moved again, and the girl fell down. "I'll help Yushiro-kun, but I might be the first one to die!" she said. Goku fell too, still covering his eye. (I need something to cover my eye with... If it stays exposed while I'm a demon, I don't know what's about to happen...) he thought. Then, Goku leapt on a wall of a pillar and jumped back in Muzan's direction.
Meanwhile, Yushiro started to inject his cells inside Nakime, trying to free her from Muzan's control. "Argh! I almost managed to free her, but Muzan's trying to get her back!" he said. "Stop interfere and die!" screamed Muzan, who was in the highest square of te deformed castle. Suddenly though, he heard three voices.
"Sun Breathing: First Form -- Dance!"
"Serpent Breathing: First Form -- Winding Serpent Slash!"
From two different directions, Goku and Obanai attacked the Demon King. "Stop insist!" exclaimed Muzan, attacking the two Hashiras.
Suddenly, the floor under Muzan's feet disappeared, and he started falling down. But then, he clenched his fist, trying to kill Nakime from the distance.
"He's trying to kill her!" said Yushiro, still injecting his cells inside the Upper Rank. But then, the three of them landed on another square. "We're not out yet..." muttered Goku, lying on the floor. Then, with his only eye, he saw the other slayers' corpses. "They must've died with remorse..."
"This crunch... The castle is about to crumble!" said Obanai. "If we don't get out, we'll die but Muzan!"
Suddenly, Goku got hit on his back once again. But then, he saw Mitsuri was about to get hit too. "Mitsuri-chan!" he screamed. Without hesitating, he threw one of his swords to Muzan. The blade stabbed Muzan in the temple, piercing through the other side of the head. "That goddammed piece of shit!" exclaimed Muzan. Then, the castle totally crumbled.
Goku was lying on the debris, with his eyes closed. Slowly, he opened his eye. (We're out... But this is no good... We're in the middle of a city!) he thought. Rapidly, he got up, grabbing his only remaining sword. "I have to get my sword back..." he decided.
Far away, at Kiriya's place...
"Now Muzan is in disavantage!" said Kiriya. "How long is it until dawn?" he asked. "An hour and a half!" replied his sister. (That's too much... Please, Goku-san, everyone... Hold on!)
"Caw! An hour and a half until sunrise!" exclaimed Rin. "We still have time..." muttered Goku. (Obanai and Mitsuri are fine, but what about everyone else? And where's Muzan?) he wondered.
Suddenly, a bunch of debris blew up. Muzan appeared again, furious. "So you're planning to keeping me here until dawn..." he said. "If you really think you can do it... Bring it on!"
Despite his conditions, Goku didn't hesitate: He rushed towards his second sword and then jumped towards Muzan. Alongside him, from three different directions, there were Mitsuri and Obanai. The three of them cut him, but there's where Goku realized: The blades trespassed Muzan's body, but somehow, it seemed like they didn't. "Instant regeneration!" exclaimed the Sun Hashira. "We did cut him, but he already regenerated!"
"You're clever, asshole!" exclaimed Muzan, attacking in every direction, forcing the three Hashiras to jump back. But then, when Muzan's arm was about to fatally wound Obanai, the members of the Demon Slayer Corps arrived, saving the three Hashiras. "What the..." muttered Goku.
"To the charge! Don't allow him to hurt the Hashiras!" exclaimed a slayer. "How many times did the Hashiras save us? A lot! If it weren't for them, we'd already been dead since a while!"
"No, don't..." tried to say Goku. But suddenly, he spat blood, and his demon form deactivated. "N-no..." he muttered, crumbling on his knees. "I can't fight anymore... I need time for my body to close my wounds!" He said, frustrated.
"The one who die quickly are lucky. And the ones who don't needs nothing to die," said Muzan. "I want all of you to see it." Obanai and Mitsuri turned and saw Goku on his knees. On his right eye, a kind of pink-gray tumour started to appear. "My attacks injects part of my blood when they land. It doesn't turn humans into demons. It works the same way as a poison. It slowly provokes destrucions and the death of the cells. Unfortunately, he'll need a bit of time before dying. But soon, very soon, Goku Tsugikuni will be dead."
(He's right... I'm about to die...) thought Goku. (I'm fucked up... If I had to die, at least I wanted to die after Muzan got defeated... Now not only am I unable to fight, but I'm also useless!)
On the battlefield, Muzan had the upper hand against Mitsuri and Obanai. Fortunately, just when Mitsuri was abou to get hit, something crushed the attack.
"Sorry, I'm late," it was Gyomei, who had finally arrived. And he was not alone. Behind Muzan's back, Sanemi slashed him. Then, he opened a bottle of gas and fired them, incendiating Muzan. "I'll tear you apart, you piece of shit!" exclaimed the Wind Hashira.
Beside Sanem, Giyuu landed. "We're all ere now, Muzan. This is your end!" he said.
Suddenly, someone grabbed Goku. The boy opened his eyes and saw Muichiro, Shinobu and Rengoku. "Finally, you have arrived, guys..." he said. "Don't talk, Gou-kun. Take this," said Shinobu, handing him an antidote. "This will slow down Muzan's poison."
Without hesitating, Goku took the antidote. "You really have an antidote to everything..." he said. "It wasn't mine. It was Tamayo's."
In that moment, Goku remembered about Tamayo. "Remain here for now, Goku," said Rengoku. "I'll stay with you, Rengoku and Kocho will help the others," said Muichiro. "Just try not to die..." said Goku. Then, he fainted. Finally, the reinforcements have arrived.
Chapter 70 - End.