On the roof of the train, the wind was blowing hard. Goku, after managing to escape Enmu's dream, reached the roof and ran to reach the demon.
After a short run, Goku eventually reached the last wagon, where Enmu was.
"Hey!" he shouted.
Enmu slowly turned.
"Uh? Why are you awake?"
"Because your Blood Demon Art sucks."
"Oh, so bold, for a simple slayer..." laughed Enmu, "are you Tanjiro Kamado?"
"No," replied Goku, "Tanjiro-kun is not here, on this train. I'm Goku Urokodaki."
"Really? Tanjiro is not on the train?" repeated Enmu.
"No, he's not," said Goku, "but don't worry, demon: I'm a way bigger problem than him."
Without wasting any other time, Goku rushed towards Enmu.
"Flame Breathing: Second Form -- Rising Scorching Sun!"
Enmu jumped and barely dodged.
"Oh, a Flame Breathing user, I see," he said, "do you know the Flame Hashira?"
"Yes, I do. We are friends," replied Goku, turning to face Enmu, "anyway, would you mind telling me your name? I want to know who I'm fighting against."
"I'm Enmu, Lower Moon One," answered Enmu.
(Lower Moon One? So he's the strongest among all of them...) realized Goku, (no problem. I'm way more stronger now. I just hope I don't have to resort to Sun Breathing at last...)
The boy rushed forward again.
"Go to sleep!" exclaimed Enmu, activating his Blood Demon Art again. Goku fell asleep, but immediately woke up.
"I know how to escape your Blood Demon Art, Enmu!" he exclaimed, "it doesn't work on me anymore!"
Then, with a slash, Goku hit Enmu again.
(He's fast, and he knows how to immediately woke up... Am I fucked up?) thought Enmu. The more the demon sended the boy to sleep, the faster Goku woke up.
"Go to sleep again, Goku!" exclaimed Enmu, trying again. This time, Goku found himself in a nightmare. His father, Yoriichi, was standing in front of him.
"You were supposed to use the Sun Breathing, not to hide it," he said, "you're a failure, son."
Goku woke up.
"He would never say such a thing, he's my father!" he yelled, "don't you dare tarnish my father's name!"
And so, furious, Goku jumped once again.
"Flame Breathing: Third Form -- Blazing Universe!"
and SLASH! Finally, Enmu got beheaded.
(Father? Did he say father?) thought the demon, as his head fell on the roof of the wagon, (wait... YORIICHI WAS HIS FATHER?)
(This is way too easy...) thought Goku, still holding his Nichirin sword with both hands.
"He... He ordered me to kill the boy with earrings... along with the Hashira!" exclaimed Enmu, who was still somehow talking, "but since only the Hashira's here... I'll kill you and then kill him!"
"How can you kill me if you're about to die?" asked Goku, "I just severed your head..."
"And that's where you're wrong, Yoriichi's son!" shouted Enmu.
In that moment, Goku's eyes widened.
"How do you know? I never told this to nobody!" he asked.
"You said it by yourself!" replied Enmu, "'don't tarnish my father's name' it's an implicit way to say you're Yoriichi's son! I was wondering why your dream was about you regrouping with Yoriichi, even if he died five hundred years ago."
"Anyway, that's not important. If you're really his son, then you're even more dangerous than the boy with earrings!"
Suddenly, from the roof of the wagon, a strange thing made of Enmu's guts reconnected his head.
"While you all were asleep, I fused with the entire train!" he laughed, "my collar bone is inside the train! Good luck to find it, Yoriichi's son!"
Enmu's head disappeared inside the train.
(Dammit... I knew it was too easy...) thought Goku. Thus, the boy started running on the roof, shouting their friends' name.
"Kyojuro! Zenitsu-kun! Inosuke-kun! No time to sleep, wake up! Protect the sleeping passengers!"
Suddenly, Goku felt something crushing through the ceiling and arriving on the rooftop.
"HEY, BOSS!" It was Inosuke.
"Inosuke-kun, you're awake!" said Goku, smiling, "this train is not safe anymore, so go downside and protect the passengers. The whole train is a demon!"
"Fine, boss! Let's kill it then!" exclaimed Inosuke.
"It won't be so easy..." sighed Goku.
"Ah! You're a genius, boss!" exclaimed Inosuke, "that's why you're the leader here!"
"I'm not the leader... But if you consider me so, then be that way," said Goku, "now, go downside and save the passengers."
"Consider it done, boss!" exclaimed Inosuke, throwing back inside the train from the hole he created earlier.
"Beast Breathing: Fifth Fang -- Crazy Cutting!" he exclaimed, cutting parts of Enmu's guts, "I'll save every last one of you guys! So you'll worship me!"
"Inosuke-kun's doing his job..." whispered Goku, still on the roof, "if he can handle this wagon, I should protect the other ones..."
Goku jumped back inside the train, the wagon ahead where Inosuke was. The entire wagon was practically wrapped by Enmu's guts. Suddenly, two tentacles flied towards Goku.
"Flame Breathing: Second Form -- Rising Scorching Sun!" exclaimed the boy, cutting the tentacles. However, other two tentacles appeared.
"No good... Even if I cut them, new ones keeps appearing..."
Meanwhile, on the other wagon, Nezuko was protecting the passengers from the tentacles. However, in the attempt of saving a passenger, two tentacles blocked her arms. Fortunately, nearby, Zenitsu had been awakened. Or not, since he fought only when he was asleep.
"Thunder Breathing: First Form -- Thunderclap and Flash!" he said, dashing through the entire wagon, cutting the tentacles, (I'll protect you... Nezuko-chan!)
On the wagon where Goku was, the boy heard Zenitsu's thunder.
(That sounded like thunder... What's going on? Maybe, Zenitsu-kun is fighting too...) he supposed, while slashing Enmu's tentacles. Meanwhile, Rengoku, now awake, was walking inside another wagon.
"So, while I was sleeping... all of this happened?" he wondered, while two tentacles tried to attack him, "I'm ashamed as a Hashira... if only I could crawl under a rock!"
With his sword, Rengoku cut through the tentacles. His flames wrapped the entire train, and Enmu felt a bit of damage. Goku, hearing the sudden boom of Rengoku's flames, realized he was awake too.
"Kyojuro!" he shouted, so Rengoku could hear him inside the other wagon. The Flame Hashira dashed through, reaching Goku.
"Here I am, Goku-kun! I'm finally awake!" he explained.
"So, what are we gonna do now?" asked Goku.
"It's simple," explained Rengoku, "there are eight wagons in this train. I'll handle five of them. The demon girl and the yellow boy handle the remaining three. You and the boar head boy'll head for the demon who's causing all of this."
"Understood, Kyojuro!" exclaimed Goku.
"Fine! Show me how gutsy you are!" exclaimed Kyojuro. Then, he rushed back, heading for the five wagons in the rear.
(Kyojuro is so fast and strong... I wish I become like him someday...) thought Goku, (anyway, I have to reach the roof again...!)
And so, after he got on the roof, Goku started searching for Inosuke.
"Inosuke-kun! Where are you, Inosuke-kun?" he shouted.
"Here, boss!" shouted Inosuke. Goku, following his voice, reached him.
"I found where the demon is! He's in the front wagon!" said Inosuke.
"Fine. Let's head for it then!" said Goku.
"Of course, boss! Let's go!" exclaimed Inosuke, following Goku.
The two of them eventually reached the front wagon, as Inosuke slashed through Enmu's guts, allowing them to enter.
"Found it!" exclaimed Inosuke.
"Inosuke-kun, before we kill him, I have to tell you one thing..." said Goku.
"Spill the beans, boss!" exclaimed Inosuke.
What I'm about to use... It's not Flame Breathing," said Goku, "I'm going to use another Breathing Technique... But you don't have to tell anybody, got it?"
"Sure, boss!" said Inosuke, "but what Breathing Technique is it?"
"It's called... Sun Breathing. Flame Breathing is not enough to kill Enmu, but Sun Breathing is... But it's a secret, so don't spill the beans, even with Kyojuro!" said Goku.
"Got it, boss!" exclaimed Inosuke, (Sun Breathing? Even a stupid like me knows what Sun Breathing is... but how can he use it? Is he related to who created it?)
Suddenly, tentacles appeared and grabbed Inosuke.
"Stay away from me!" he yelled, cutting the tentacles. But then, Goku entered in action.
"Sun Breathing: First Form -- Dance." The tentacles all disappeared.
"Oh, by the way... I'm the son of the creator of Sun Breathing... And also half-demon, if you were wondering why I'm able to use Sun Breathing."
Inosuke, instead of not believing Goku's words or asking even more, found him even greater.
(Eh? Sun Breathing's creator's son? And half-demon? He really is my boss!) he thought.
"The demon is inside the main structure," said Goku.
"I know, boss!" exclaimed Inosuke. Then, he jumped high.
"Beast Breathing: Second Fang -- Slice!" he shouted. The main structure got destroyed, and finally, Enmu's collar bone was exposed.
"This is his neck!" understood Goku, "Sun Breathing: Second Form -- Clear Blue Sky!"
But then, suddenly, Enmu blocked it with his guts.
"Shit... He blocked it..." muttered Goku. Without wasting time, the boy took the conductor and brought him safely, as a shape similar to a bowl created on the main wagon.
Goku and Inosuke divided. Goku was on the right side, Inosuke on the left.
"Inosuke-kun! We're gonna synchronize our Breathing and attack together, okay?"
"Fine, boss! Let's do this!"
"Let's go!" shouted Goku, starting to run. But then, a massive amount of Enmu's guts with a lot of eyes appeared, with the kanji of "Dream" on the pupil. Fortunately, Goku managed to close his eyes in time.
"If I keep my eyes closed, I won't fall asleep!" he said, slashing throught the amount of guts, "fortunately, I can fight even without sight, since my other senses are enhanced as a demon!"
"Same for me, boss!" said Inosuke, "my mask doesn't make him know where I'm looking, so I don't fall asleep either!"
"That's fine!" exclaimed Goku.
"You loser eyeballs!" exclaimed Inosuke, slashing throught as well. Suddenly though, the conductor of the train charged at Inosuke with a knife.
"Inosuke-kun!" yelled Goku, kicking the conductor away.
"Thanks, boss! You really are amazing!" exclaimed Inosuke.
"No time for flattery, Inosuke-kun! Slash throught the guts so I can sever his neck!" said Goku.
"Of course, boss!" shouted Inosuke. But suddenly, other tentacles appeared. Goku and Inosuke jumped on them.
The two of them slashed through the tentacles on returned back on the train.
(This time... I'll end this!) thought Goku, with his eyes still closed.
"It's my moment!" exclaimed Inosuke, "Beast Breathing: Fourth Fang -- Slice 'n Dice!"
Enmu's neck got exposed. Goku arrived just in time, and before Enmu could cover his bone again...
"Sun Breathing: Second Form -- Clear Blue Sky!"
And BOOM! Enmu's head finally got severed.
Enmu's gust exploded inside the train, and the train itself derailed due to explosion of Goku's attack.
(Father... thank you... for protecting me...) thought Goku, as he lost balance and fell from the train. (We... We did it...)
"Boss!" exclaimed Inosuke, who fell on his feet and reached Goku, "are you hurt?"
"No, I'm okay," said Goku.
"Seems like the threat is over..." said Inosuke.
"Yeah, it seems so..." whispered Goku.
"So, can you explain me who you are, exactly?" asked Inosuke.
"No need to hide anymore. Not to you," said Goku, getting up, "you already saw my Sun Breathing, so I'll spit it out. My real name is Goku Tsugikuni, I can use Sun Breathing because I'm the son of Yoriichi Tsugikuni, who you should also know. Inside of me, there are demonic cells, so I'm both human and demon. That's all."
When Goku finished the explanation, Inosuke scratched his head.
"I believe you, boss. Since you told me not to tell anybody, I won't. But only because I admire you!"
"That's fine..." muttered Goku. Finally, there was one person who knew Goku's secret.
Chapter 16 - End.