After the dragon breather revealed himself to the demon fishes, YN wipe out all the demon fishes and with a help of Mitsuri who's using a strange type of sword yet its special made by the chief of the village.
YN: Those were the last of them. I see no other demon aura near.
Mitsuri: Then the village is finally safe.
YN: I'm afraid that this is far from over.
Mitsuri: Hmm?
YN: Those were mere demon henchmen or something, someone was commanding them to raid this village.
Mitsuri: Who would sent many demons to destroy this village?
YN couldn't help but smirk to know that this demon may be powerful than the demon fishes.
YN: A worthy challenge.
CN: Caw! There's a another demon close! Another demon close! Follow me!
YN sheathe his sword before leaving but he stops to talk to Mitsuri.
YN: Go and help the chief, after that, find Tanjiro and Nezuko help him. I'll meet back as soon as possible.
Mitsuri could help but blushes of how manly he spoken. Before she could say anything, he left and follow his crow.
Short time skip.
As YN follows his crow, they finally reach the destination and he notice that Muichiro is trapped in some kind of water while a child tries to free him.
However, he also notice that there's a smaller demon fish but with strange claws yet sharp enough to kill anyone.
Quickly figuring that the boy is in danger, he wasted no time but to kill the demon fish before it could get near the boy. The boy was shock to see YN in his dragon form.
YN: You alright?
Kotetsu: Y-yeah, who are you?
YN: (Smiles.) I'm a friend.
YN then approach Muichiro and free him from the water prison as Muichiro is taking a deep breath.
YN: Get up, the fight is not over.
Muichiro then gets up after removing the needle attached to him, but he also notice YN who's facing at the small shed.
YN: So that's where the upper rank is?
Muichiro: Yeah...
YN then looks at Muichiro as he did then same.
Muichiro & YN: ....
Muichiro & YN: YOOUUU!!
Muichiro: ....
YN: ....
Kotetsu: ....
Muichiro & YN: (Tilts their heads.) Have we met before?
Kotetsu: 💢 ARE YOU KIDDING ME!? WE HAVE A DEMON OVER THERE AND ALL YOU TWO DOING IS POINTING AT EACH OTHERS!?
Short time skip
After they both figure out who they are, they went directly back to saving Haganezuka and Kanamori from the upper rank Gyokko and the demon notice the mark appearing on Muichiro face.
But what made him more shock is that he sees YN in his dragon form. Both are now prepare to face the demon now that Muichiro got his new sword. However, no matter how close they were at, the demon quickly dodges by going back in his vase almost like a turtle and vanishes.
The demon kept babbling about how high and might he is until the demon slayers shut him up by telling his vase is misshapen and painted bad, in other words, its terrible. This made the demon furious as he unleash a swarm of fishes at them.
Though Muichiro still has poison in his system, he uses his mist breathing sixth form to slice every single one of the fishes with an incredible speed. However, the fishes would disperse poison to poison more against Muichiro yet thankfully YN unleashed his dragon breathing 6th form to burn and cleans the fishes to dust. However, his dragon breathing became stronger than before due to breathing like a dragon.
After the fishes were finally clear, they see an opening and went for Gyokko neck from both sides until he vanishes again, this time leaving his skin like a snake.
Muichiro: Oh, what a pain in the butt.
YN: How many times must he run away?
Next thing they know Gyokko is by the tree once again.
Muichiro: Would you mind not dodging and racing up at the trees?
Gyokko: Hyo, hyo, hyo! Allow me to show you my true form,
Muichiro: Sure.
YN: Fine.
Gyokko: You two are the third and fourth person to see me in this state.
Muichiro: So a lot of us, huh?
YN: I don't know, you don't see him around because he always hides in his vase.
Muichiro: Makes sense.
Gyokko: Shut up!
While Gyokko been making a speech about his hidden form. YN and Muichiro were having a chat while not paying attention.
YN: So how's the new sword?
Muichiro: Good balance. Especially the sharpness. How about yours?
YN: They're perfect, all that struggles in training to earn it really did paid off. I'm also glad you got your nichirin blade on time before you could get crushed.
Muichiro: Mhm.
Gyokko: You two are not even paying attention to me!
Muichiro: Oh right, we forgot about that.
YN: I thought he was talking to himself.
Gyokko: Shut your mouths, you dimwitted brats! These translucent scales are even harder and stronger than diamonds! Not even your dragon scales can protect you because unlike you, I knead them myself inside my vase!
Gyokko: (Evil smile.) Behold! My perfect beauty! Now bow down to your knees!
YN and Muichiro: ..........
Gyokko: WHY AREN'T YOU TWO SAYINV SOMETHING!? YOU USELESS PUPPETS! YOU TWO REALLY KNOW HOW TO RUB SOMEONE THE WRONG WAY, YOU BRATS!!
YN and Muichiro were then picking their nose with their pinky.
Muichiro: But you just told us to shut our mouths.
YN: So we can't do both of them at the same time.
Muichiro: Not to mention, it didn't really surprise me.
YN: You too? I mean I've seen better things than this demon-
Suddenly Gyokko appear in front of them with an incredible speed and has a fist ready to hit their faces. Luckily they both manage to catch up to his speed while dodging his hits. Muichiro manage to get to high ground by the tree while YN is at a safe distance from Gyokko. However, Gyokko manage to touch muichiro uniform as it turns into fishes.
Gyokko: Hyo, hyo, hyo. Didn't you just tell me not to race up to the trees? What a hassle!
The demon then talks about his godlike power and how his form is powerful and beauty before Muichiro collapse due to the poison. Gyokko laughs until YN got sick and tired hearing this babbling and unleash a powerful slash aiming at Gyokko shut him up.
Gyokko: What the!?-
YN: SCREW YOUR STUPID VASE AND BEAUTY CRAP!
Gyokko: Huh!?
Muichiro: Hm?
YN: I DIDN'T COME ALL THE WAY HERE JUST TO SEE YOUR STUPID BEAUTY AND HEAR YOUR CRAPPY BABBLING! I CAME HERE TO KNOW WHERE MUZAN KIBUTSUJI IS! WHO'S SAID TO BE THE MOST STRONGEST DEMON THAN ALL OF YOU UPPER RANKS!!
Gyokko couldn't help but laugh to see how snapped YN became. But to tell you the truth, Gyokko wasted his time with all of his babbling stuff.
Gyokko: You think you can beat Lord Muzan? Hyo, hyo, hyo! You won't live long enough to know! Blood demon art: Killer Fish Scales!
Gyokko charge at him with a massive speed yet YN took a deep breath to calm and focus in his mind.
YN: Dragon breathing 3rd form: Blue Dragon River Flow...
Right when Gyokko got close, YN easily dodges them but could lay a hit at the demon.
Gyokko: Hyo, hyo, hyo! You can't even fight back! How can you even strong enough to fight me without doing anything?
YN: Because I'm building focus unlike you.
Gyokko: (Confused.) Hmm?
This only gave seconds of distraction but it was enough to cut his arms before backing away. Unfortunately Gyokko quickly grow new arms back as he evilly smirk.
Gyokko: Was that all?
YN: Hmph, did you expect me to be impressed by you? You've already wasted my time, at least the upper rank 6's put up more of a fight than you did.
Gyokko: Why you!-
YN: Dragon breathing 7th form....
Gyokko then saw black smoke appearing from the surface of YN skin as he closes his eyes to continue to focus.
Gyokko: 'I'll finish him before he does anything!'
With his speed, he charges at YN until YN open his eyes.
YN: Black dragon...
Everything became pitch black as Gyokko tries to see anything but nothing.
Gyokko: What is this?
YN: Did you really thought all of your demon fishes you used would stand a chance against a single dragon?
Gyokko can hear his voice but he cold see him until he saw the dragon eyes that is approaching him. He throws every punch at him but he didn't hit anything. Soon the darkness faded and everything appeared as he hears YN voice.
YN: You're lucky enough that you've merely drawn my attention.
Gyokko sees YN behind him who's facing the other way as he slowly sheaths his swords.
Gyokko: Was that all you got? Hyo, hyo, hyo! I'm not impressed-
Once YN sheathed his final sword, the demons head fell off to the ground.
Gyokko: Huh?
YN: Daylight Seeker...
Gyokko: 'D-d-d-d-decapitated!? Decapitated, decapitated, decapitated!? How!? How did I got defeated by a idiot like him!?'
YN: Its over for you demon.
Gyokko: CURSES!!
Gyokko tries to grow his arms from his neck but it was taking longer.
Gyokko: This should just never happen! You stupid dragon! How dare you slice my head off!
YN: Can you just shut up? You really talk too much.
Gyokko: Why you! Die!
Gyokko jumps straight to YN but YN just kicks him like a soccer ball where Gyokko was cut into pieces by Muichiro.
Muichiro: I've heard enough, so...could you just go to hell already?
The rest of the demons body disintegrated before YN approaches towards Muichiro.
YN: Oi, you should probably get checked, the poison is probably gonna knock you out at any moment.
Muichiro: I'm fine really. You don't need to worry about me-
Suddenly foam appear on his mouth as he fainted.
YN: Oh, that was quick.
Kanamori arrived just on time after Muichiro collapse.
Kanamori: Thank goodness you're okay- Aaaah! Lord Tokito! Oh crap! Oh crap! Is he going to die!?
YN: Not at the moment.
Kanamori: What are we supposed to do!?
YN: Where's Haganezuka?
Kanamori: Aren't you afraid your friend is gonna die!?
YN: Just turn him to the side before he chokes in the foam.
Kanamori did what he said before YN leaves.
Kanamori: Wait, wait wait! Where are you going!?
YN: To find Tanjiro and Mitsuri. There must be another upper rank demon near. There's no time for details, Kotetsu will arrive soon to help.
Kanamori: Wait but-
Before he could say anything YN ran until Kanamori shouted.
Kanamori: You're going to the wrong direction!
Time skip
Meanwhile with Tanjiro, Nezuko, and Genya. They were both struggling to face an upper rank 4 aka, Hantengu.
Who unleashed 4 wooden dragon which is his blood demon art. Each wooden dragon head has its own powers, lightning, sound, wind, and blast wind.
Even with Hinokami Kagura, they were all struggling to fight back and their backs were against the wall until one of the wooden dragon caught and swallowed Tanjiro. Tanjiro struggles to escape but it was no use as it squeezes him until Mitsuri arrived and wasted no time to cut the wooden dragon open to free and save Tanjiro.
Hantengu: A Hashira?
Mitsuri: Eeek! What a ghastly monster! What is that thing?
Tanjiro: (Coughs.) Ms. Kanroji?
Mitsuri: (Smiles.) Are you okay? Sorry I'm late! That was really cutting it close, huh?
Suddenly the wood dragons that were holding Genya and Nezuko were chopped in pieces, revealing it was YN to slices the wooden dragons.
Tanjiro: YN!?
YN: Sorry I'm late, had a demon problem to deal with.
Mitsuri: Tanjiro.
She place her hands on his shoulder to comfort him and let him know that he can rest now. Unfortunately he couldn't hear well due to his eardrums are burst. Thankfully he manage to hear YN for the moment.
YN: What are we looking at, Tanjiro?
Tanjiro explains the demons blood demon art while Mitsuri holds it off. Tanjiro explain that the demon they're seeing can't die since it isn't the main body, the real one is hidden in a wood that protects the real demon. YN then quickly figures out a plan against the upper 4.
YN: I have a plan.
Tanjiro: (Surprise.) You do?
YN: You go after the real one, Mitsuri and I will deal with this one-
Soon after, they see Mitsuri has her blades close to the fake demon neck as it opens its mouth to prepare a massive blast.
Tanjiro: Ms. Kanroji! That's not the main body! It won't die if you cut off its head!
YN: Get out of there!
Her eyes became widen and it was too late as it unleash a sonic sound blast at her. Fortunately, her body wistand the blast but she was unconscious when she fell in her knees. It was clear that she's an abnormal constitution. The demon approaches her to devour her, but he was then knock back by YN fist since he couldn't risk hurting her due that she was too close for his sword. Everyone else get her away from the demon.
YN: You all right, Mitsuri?
Tanjiro: Get up! The next attack is coming!
Genya: (Shouting.) I know that, all right?
YN: We're wasting time here! You guys get her out of here and find the main body! She's our best chance to go find the main demon!
Hantengu: How comical...
Hantengu unleash a massive lighting from above them.
Genya: You're kidding me!
YN: Too late!
A lightning hit them where it caused a massive cloud of dusts. But Mitsuri saved them at the brink of time.
Mitsuri: You guys, thank you! I'm a Hashira, and I messed up! I'm sorry! I'll never let my friends die, okay! Because the demon slayer corps is my precious home! Upper rank or whatever you are! It makes no difference to me!
YN: Great....now I feel embarrassed
Genya: You and me both...
Mitsuri: No way will I ever lose to evil people! Now brace yourself! I'm going for the kill now!
Tanjiro: Look out!
Hantengu unleash another attack but with a wind from above.
YN: Everybody, move!
YN wasted no time to push them all away before a massive attack hits him as the ground becomes a shape of a leaf and it weigh like a tons. This made YN fell on his knees.
Tanjiro: YN!
Mitsuri: Oh no!
Hantengu: Hmph, just another demon slayer, finished-
Suddenly he notice YN stand up moving slowly even thought the attack is still heavy on him. Each step he took crushes the ground. Hantengu became shock to see someone can survive a heavy attack.
Hantengu: How is it not working on you?
YN: A weight like this is nothing compared to the boulders I've been carrying.
Hantengu: You're not a human, are you?
YN prepares to fight against the upper rank 4 demon by himself.
YN: Of course I am. However, I stand above all breathing technique that has ever existed. Only the sun breathing is my equal. As of right now, you're facing against the dragon breather, and this will be your last battle.
Tanjiro: YN?
YN: Tanjiro, get everyone out of here and find the main demon. I can hold this one off on my own.
Mitsuri: But-
YN: There's no time for talk, I can handle this one on my own.
Mitsuri blushes to see how manly he is to be brave enough.
Tanjiro: Got it, be careful.
YN: Same goes for you.
Everyone leave but Hantengu tries to stop him.
Hantengu: No you don't!
Hantengu sends the wooden dragons at them but YN immediately chop them to pieces.
YN: Dragon breathing, 6th form: Red Dragon Flaming Wings!
Most of the wooden dragons are burning down.
Hantengu: You risk your life to send the brutal fiends to torment the weak...? Have you no shame.
YN was silent for the minutes until he chuckles which confused the demon.
YN: You see us as brutal creatures who find and harm the weak? What a joke.
This only made the demon angry until YN continue speaking.
YN: You can speak high and might as if you're protecting the weak. But your aura never lies to me. You use the main demon as a victim and you're accusing us as a real threat?
Sure humanity are cruel, but to tell you the truth, you could've been better with all that power you had by protecting and teaching them how to be better. But yet here you are raiding a village were there are innocent lives. You're no different than those lowly greedy demons I've killed.
Suddenly Hantengu sees an old man as he said the same thing.
Hanzo: You're no different than those lowly greedy demons I've killed.
YN/Hanzo: How would you become better when you choose the path of blood shed?
Hantengu: Enough of meaningless words. Die like the other demon slayers.
He unleash all the wooden dragons at him as YN just breathes calmly as he prepare to make his move. Hantengu then sees Hanzo in the background of YN who's preforming the same move.
YN: Dragon breathing, 1st form....
YN unleash his strength of his first form against the wooden dragons as the blades got closer to the demon. Unfortunately, he dodge a nick of time before he could've been killed, however, this made him nervous to see a demon slayer who could unleash a powerful blow. One that YN hasn't used ever since the Final Selection and this time, it was stronger than before.
YN: Dragon Swift Claws!
All of the wooden dragons were slices down as it surprises Hantengu.
YN: Now, if you're thinking you can use those wooden dragons against me, then you're wrong. You're fighting against a real dragon!
YN then charges at the demon and just when the demon is at his sword range, it Suddenly disintegrated on its own which made YN confused as dawn came.
YN: 'What the...? He just vanished... Then that means...They must've killed the main demon.'
The scene then faded to black as the sun was about to shine where he stands.
Expect the final chapter to be short.